Skip to main content

Bulova Day Date

Bulova Accuquartz Day & Date Vintage 18K Yellow Gold Watch
Bulova Accuquartz Day & Date Vintage 18K Yellow Gold Watch

Bulova Accuquartz Day & Date Vintage 18K Yellow Gold Watch

By Bulova

Located in Great Neck Plaza, NY

A study in form, hue, and precision. This striking Bulova watch features a cushion-shaped case crafted from 18k gold, exuding a warm, golden glow. The multicolor dial is adorned wit...

Category

21st Century and Contemporary Wrist Watches

Materials

18k Gold

Vintage Bulova Accutron Deep Sea 666 Feet Stainless Steel Day Date Men’s Watch
Vintage Bulova Accutron Deep Sea 666 Feet Stainless Steel Day Date Men’s Watch

Vintage Bulova Accutron Deep Sea 666 Feet Stainless Steel Day Date Men’s Watch

By Accutron

Located in New York, NY

This vintage Bulova Accutron Deep Sea men’s watch features a stainless steel case with a distinctive gray dial, applied hour markers, and a day-date window at 3 o’clock.

Category

20th Century Wrist Watches

Materials

Stainless Steel

Recent Sales

Bulova Classic Day Date Stainless Steel Black Dial Quartz Mens Watch 96C107
Bulova Classic Day Date Stainless Steel Black Dial Quartz Mens Watch 96C107

Bulova Classic Day Date Stainless Steel Black Dial Quartz Mens Watch 96C107

By Bulova

Located in New York, NY

Minute Markers around the outer rim. Three Subdials - Date, Day and 24 Hour. This Watch is Water Resistant at 30 meters.

Category

21st Century and Contemporary Japanese Wrist Watches

Bulova Accuquartz 14 Karat Yellow Gold Men's Watch
Bulova Accuquartz 14 Karat Yellow Gold Men's Watch

Bulova Accuquartz 14 Karat Yellow Gold Men's Watch

By Bulova

Located in Dallas, TX

Champagne dial with stick hour markers with Bulova logo ; day and date at 3 o'clock. Black original Bulova strap with gold pated Bulova buckle.

Category

20th Century Swiss Wrist Watches

Bulova Yellow Gold Accutron Vintage Day Date Wristwatch, 1970s
Bulova Yellow Gold Accutron Vintage Day Date Wristwatch, 1970s

Bulova Yellow Gold Accutron Vintage Day Date Wristwatch, 1970s

By Bulova

Located in Metairie, LA

Bulova’s "Accutron" watches, first sold in October 1960, use a 360 Hz tuning fork instead of a balance wheel as the timekeeping element. The inventor, Max Hetzel, was born in Basel,...

Category

Vintage 1970s Swiss Modernist Wrist Watches

Materials

14k Gold, Yellow Gold

You May Also Like

Cyma Ladies Gold Diamond Watch 18 Karat
Cyma Ladies Gold Diamond Watch 18 Karat

Cyma Ladies Gold Diamond Watch 18 Karat

Located in New York, NY

Cyma Ladies Watch Working Swiss quartz battery movement. Functional date. .50 carat natural diamonds g color vs2 clarity 49.3 grams 18 karat yellow gold 24 mm wide case 13 mm w...

Category

Early 2000s American Wrist Watches

Materials

Diamond, Yellow Gold, Gold, 18k Gold

Bulova Gold Filled Art Deco Watch with Factory Original Dial 1950's
Bulova Gold Filled Art Deco Watch with Factory Original Dial 1950's

Bulova Gold Filled Art Deco Watch with Factory Original Dial 1950's

By Bulova

Located in Long Beach, CA

FACTORY / HOUSE: Bulova Watch Company STYLE / REFERENCE: Art Deco / Round Style METAL / MATERIAL: Yellow Gold Filled CIRCA / YEAR: 1950's DIMENSIONS / SIZE: Length "Lug Tip to Lug Ti...

Category

Vintage 1950s Swiss Art Deco Wrist Watches

Materials

Gold-filled

Seiko Steel World Time Watch circa, 1970's in excellent Original Condition
Seiko Steel World Time Watch circa, 1970's in excellent Original Condition

Seiko Steel World Time Watch circa, 1970's in excellent Original Condition

By Seiko

Located in Long Beach, CA

FACTORY / HOUSE: Seiko Watch Company STYLE / REFERENCE: World time / Tonneau Shape METAL / MATERIAL: Stainless Steel CIRCA / YEAR: 1970's DIMENSIONS / SIZE: Length 41mm X Width 46mm ...

Category

Vintage 1970s Japanese Modern Wrist Watches

Materials

Stainless Steel

Zodiac Sea Wolf Stainless Steel Automatic Diver Wrist Watch, circa 1960s
Zodiac Sea Wolf Stainless Steel Automatic Diver Wrist Watch, circa 1960s

Zodiac Sea Wolf Stainless Steel Automatic Diver Wrist Watch, circa 1960s

By Zodiac

Located in Long Beach, CA

FACTORY / HOUSE: Zodiac STYLE / REFERENCE: Diver METAL / MATERIAL: Stainless Steel CIRCA / YEAR: 1960's DIMENSIONS / SIZE: Length 43mm X Diameter 35mm MOVEMENT / CALIBER: Manual Win...

Category

Vintage 1960s Swiss Modernist Wrist Watches

LIP stainless Steel Super Nautic-Ski Electronic Wristwatch, circa 1972
LIP stainless Steel Super Nautic-Ski Electronic Wristwatch, circa 1972

LIP stainless Steel Super Nautic-Ski Electronic Wristwatch, circa 1972

By LIP 8

Located in Saint-Didier, Provence-Alpes-Côte d'Azur

LIP Rare Super Nautic-Ski, circa 1972 Steel, rubber strap. Blue dial. Electronic (battery to change). Box. LIP.R184. Warranty 1 year.

Category

Vintage 1970s French Wrist Watches

Ladies Omega 14K Yellow Gold Automatic Watch with Mesh Band and Gold Dial
Ladies Omega 14K Yellow Gold Automatic Watch with Mesh Band and Gold Dial

Ladies Omega 14K Yellow Gold Automatic Watch with Mesh Band and Gold Dial

By Omega

Located in San Juan Capistrano, CA

Ladies Omega Vintage 14K Yellow Gold Automatic Watch with Mesh Band and Gold Dial. (Pre-Owned) Pre-Owned Brand: Omega. Gender: Ladies. Dial Color: Gold. Case Back: Solid. Band Type: ...

Category

21st Century and Contemporary Wrist Watches

Materials

Yellow Gold

Bulova Crystal Turnstyle Two-Tone Steel Mop Dial Quartz Ladies Watch 98L245
Bulova Crystal Turnstyle Two-Tone Steel Mop Dial Quartz Ladies Watch 98L245

Bulova Crystal Turnstyle Two-Tone Steel Mop Dial Quartz Ladies Watch 98L245

By Bulova

Located in New York, NY

Display model Bulova Crystal Turnstyle Watch 98L245. The Watch has Minor Blemishes From Storing. Original Box and Papers are Included. This Beautiful Timepiece is Powered by Quartz (...

Category

21st Century and Contemporary Japanese Wrist Watches

Glycine Stainless Steel Date Automatic Watch, circa 1950s
Glycine Stainless Steel Date Automatic Watch, circa 1950s

Glycine Stainless Steel Date Automatic Watch, circa 1950s

By Glycine

Located in Long Beach, CA

FACTORY / HOUSE: Glycine Watch Company STYLE / REFERENCE: Auto Date / Ref. 645 METAL / MATERIAL: Stainless Steel DIMENSIONS: Length 42mm X Diameter 34mm CIRCA: 1950's MOVEMENT /...

Category

Vintage 1950s Swiss Art Deco Wrist Watches

Materials

Stainless Steel, Steel

Ulysse Nardin Stainless Steel Sports Automatic Watch, circa 1970s
Ulysse Nardin Stainless Steel Sports Automatic Watch, circa 1970s

Ulysse Nardin Stainless Steel Sports Automatic Watch, circa 1970s

By Ulysse Nardin

Located in Long Beach, CA

FACTORY / HOUSE: Ulysse Nardin Watch Company STYLE / REFERENCE: Sports Style / Ref. A 7650 METAL / MATERIAL: Stainless Steel DIMENSIONS: Length 32mm X Width 36mm CIRCA: 1970's MOVEME...

Category

Mid-20th Century Swiss Wrist Watches

Bulova Sinatra Fly Me To The Moon Skeleton Date Automatic Men's Watch 96B348
Bulova Sinatra Fly Me To The Moon Skeleton Date Automatic Men's Watch 96B348

Bulova Sinatra Fly Me To The Moon Skeleton Date Automatic Men's Watch 96B348

By Bulova

Located in New York, NY

A tribute to timeless elegance and the legendary Frank Sinatra, the Bulova "Fly Me to the Moon" Automatic Men's Watch Ref. 96B348 blends vintage charm with modern craftsmanship. Feat...

Category

20th Century Wrist Watches

Materials

Stainless Steel

Bulova Mid Century Vintage Ladies 3 Tone Gold Filled Watch All Original, 1960's
Bulova Mid Century Vintage Ladies 3 Tone Gold Filled Watch All Original, 1960's

Bulova Mid Century Vintage Ladies 3 Tone Gold Filled Watch All Original, 1960's

By Bulova Watch Company

Located in Long Beach, CA

FACTORY / HOUSE: Bulova Watch Co. STYLE / REFERENCE: Mid Century METAL / MATERIAL: 3 Colors Gold Filled CIRCA / YEAR: 1960's DIMENSIONS / SIZE: Length 30mm x Width 10mm MOVEMENT / CA...

Category

Vintage 1960s American Artisan Wrist Watches

Bulova 14 Karat Yellow Gold Men's Wristwatch, 1950s
Bulova 14 Karat Yellow Gold Men's Wristwatch, 1950s

Bulova 14 Karat Yellow Gold Men's Wristwatch, 1950s

By Bulova

Located in Wallkill, NY

Stunning 14K gold Bulova Watch, this watch has had little use over it's years, Black Leather band. Measures Luge to Luge 38.6 mm or 1.5 in Width 31.97 mm or 1.26 in. It is In working...

Category

Vintage 1950s American Wrist Watches

Materials

14k Gold, Yellow Gold

Bulova Accutron Men's Watch - Gold Filled Stainless Steel Quartz
Bulova Accutron Men's Watch - Gold Filled Stainless Steel Quartz

Bulova Accutron Men's Watch - Gold Filled Stainless Steel Quartz

By Bulova

Located in Greensboro, NC

Brand: Bulova Model: Accutron Specific Year: 1970 Movement: Quartz Movement Maker: USA Metal Content: Gold Filled & Stainless Steel Fastening Type: N/A (stretches over wrist) F...

Category

Vintage 1970s Wrist Watches

Materials

Gold-filled, Steel, Stainless Steel

Bulova Rare 14Kt. Solid Yellow Gold Accutron New Condition
Bulova Rare 14Kt. Solid Yellow Gold Accutron New Condition

Bulova Rare 14Kt. Solid Yellow Gold Accutron New Condition

By Accutron

Located in Long Beach, CA

FACTORY / HOUSE: Accutron, by Bulova STYLE / REFERENCE: Asymmetrical / M9 METAL / MATERIAL: 14Kt. Solid Gold DIMENSIONS: Length 42mm X Diameter 35mm CIRCA: 1960's MOVEMENT / CALIB...

Category

Vintage 1960s American Modern Wrist Watches

Materials

14k Gold, Yellow Gold

Bulova Solid 14Kt Yellow Gold Mid Century Manual Winding Watch, 1960's
Bulova Solid 14Kt Yellow Gold Mid Century Manual Winding Watch, 1960's

Bulova Solid 14Kt Yellow Gold Mid Century Manual Winding Watch, 1960's

By Bulova Watch Company

Located in Long Beach, CA

FACTORY / HOUSE: Bulova Watch Co. STYLE / REFERENCE: Mid Century METAL / MATERIAL: 14kt Yellow Gold CIRCA / YEAR: 1960's DIMENSIONS / SIZE: Length 38mm x Diameter 33mm MOVEMENT / CAL...

Category

Vintage 1960s American Modernist Wrist Watches

Materials

14k Gold, Yellow Gold

Ebel Beluga 18k Yellow Gold Diamond Dial Ladies Watch
Ebel Beluga 18k Yellow Gold Diamond Dial Ladies Watch

Ebel Beluga 18k Yellow Gold Diamond Dial Ladies Watch

By Ebel Beluga

Located in Great Neck Plaza, NY

Ebel Beluga is a stunning example of Swiss craftsmanship. Featuring a round case made of luxurious 18k gold, this watch combines elegance with precision through its reliable quartz m...

Category

21st Century and Contemporary Wrist Watches

Materials

18k Gold

People Also Browsed

18 Kt Rainer Brand Triple Date Moonphase Chronograph Wrist Watch, Collectors
18 Kt Rainer Brand Triple Date Moonphase Chronograph Wrist Watch, Collectors

18 Kt Rainer Brand Triple Date Moonphase Chronograph Wrist Watch, Collectors

Located in Antwerp, BE

18 Kt Rainer Brand Triple Date Moonphase Chronograph Wrist Watch, Brand New In Box With all Warranty Papers, Rare Collectors Watch Case : 18 Kt Solid Gold, Diameter 39.5 mm Strap :...

Category

20th Century Swiss Artisan Wrist Watches

Materials

18k Gold

Universal Geneve Ladies yellow Gold Diamond Baguette Bezel Quartz Wristwatch
Universal Geneve Ladies yellow Gold Diamond Baguette Bezel Quartz Wristwatch

Universal Geneve Ladies yellow Gold Diamond Baguette Bezel Quartz Wristwatch

Located in Stamford, CT

Universal Geneve ladies 18k yellow gold dress watch with a baguette diamond bezel. The watch has a sleek gold dial with four round diamonds as markers for the twelve, three, six, and...

Category

Late 20th Century Wrist Watches

Materials

Diamond, 18k Gold, Yellow Gold, Gold

Patek Philippe 18Kt Solid Gold Dress Watch circa 1980's with Original Bracelet
Patek Philippe 18Kt Solid Gold Dress Watch circa 1980's with Original Bracelet

Patek Philippe 18Kt Solid Gold Dress Watch circa 1980's with Original Bracelet

By Patek Philippe

Located in Long Beach, CA

FACTORY / HOUSE: Patek Philippe & Co. STYLE / REFERENCE: Dress Watch / Reference 4217-10 METAL / MATERIAL: 18Kt Solid Gold CIRCA / YEAR: 1980's DIMENSIONS / SIZE: Length 23mm X Widt...

Category

Vintage 1980s Swiss Modernist Wrist Watches

Materials

Gold

Baume et Mercier Watch in 18K Yellow Gold
Baume et Mercier Watch in 18K Yellow Gold

Baume et Mercier Watch in 18K Yellow Gold

By Baume & Mercier

Located in Paris, FR

Baume et Mercier lady's wristwatch in 18 kt yellow gold, oval dial mechanical movement. Golden background, applied baton indexes. Winder set with a sapphire cabochon. Flexible bracel...

Category

Vintage 1960s Swiss Wrist Watches

Materials

Sapphire, 18k Gold, Yellow Gold

CARTIER Paris 1970 Automatic Large Ceinture Wristwatch In 18 Kt Yellow Gold
CARTIER Paris 1970 Automatic Large Ceinture Wristwatch In 18 Kt Yellow Gold

CARTIER Paris 1970 Automatic Large Ceinture Wristwatch In 18 Kt Yellow Gold

$17,200Sale Price|20% Off

H 1.18 in W 1.22 in Dm 9 in L 9 in

CARTIER Paris 1970 Automatic Large Ceinture Wristwatch In 18 Kt Yellow Gold

By Cartier

Located in Miami, FL

An automatique Ceinture large wrist-watch designed by Cartier. This is the rare large model of the Ceinture automatique wristwatch, created in Paris France by the jewelry house of C...

Category

Vintage 1970s French Modernist Wrist Watches

Materials

Gold, Yellow Gold, 18k Gold

Cartier Louis Cartier Classic Tank, Ladies Bracelet Wrist Watch
Cartier Louis Cartier Classic Tank, Ladies Bracelet Wrist Watch

Cartier Louis Cartier Classic Tank, Ladies Bracelet Wrist Watch

By Cartier

Located in Chicago, IL

Circa 1990s Cartier, Louis Cartier, Classic Tank Wrist Watch, 24 X 18 M.M. 18k Yellow Gold 2 piece case, quartz movement, white dial with Black Roman numerals, Sapphire crown. 1/2 in...

Category

1990s Swiss Wrist Watches

Materials

18k Gold

Chopard Happy Diamonds Sport 18 Karat Gold Ladies Watch
Chopard Happy Diamonds Sport 18 Karat Gold Ladies Watch

Chopard Happy Diamonds Sport 18 Karat Gold Ladies Watch

By Chopard

Located in Berlin, DE

Quartz movement. 18 Karat original Gold clasp. 100 percent original product! Including original certificate of authenticity. You will receive the watch with a new battery service.

Category

20th Century Wrist Watches

Materials

18k Gold

Jaeger LeCoultre Reverso, Gran Sport, Duo Face, GMT, Steel, Ref 295.8.51
Jaeger LeCoultre Reverso, Gran Sport, Duo Face, GMT, Steel, Ref 295.8.51

Jaeger LeCoultre Reverso, Gran Sport, Duo Face, GMT, Steel, Ref 295.8.51

By Jaeger-LeCoultre

Located in Antwerp, BE

Jaeger Le Coultre Reverse Gran Sport Duo Face GMT steel, Ref 295.8.51 Recently Complete Revision by Jaeger Le Coultre for over 1400 Euro Model: Reverso, Gran sport Ref number: 29...

Category

Early 2000s Swiss Artisan Wrist Watches

Materials

Steel

Rolex 18Kt Gold Ladies Modernist Style for Serpico & Laino Diamond Bezel 1960's
Rolex 18Kt Gold Ladies Modernist Style for Serpico & Laino Diamond Bezel 1960's

Rolex 18Kt Gold Ladies Modernist Style for Serpico & Laino Diamond Bezel 1960's

By Rolex

Located in Long Beach, CA

FACTORY / HOUSE: Rolex Watch Company STYLE / REFERENCE: Art Deco / Reference 106 METAL / MATERIAL: 18Kt Solid Gold / Factory Diamond Bezel CIRCA / YEAR: 1960's DIMENSIONS / SIZE: Dia...

Category

Vintage 1960s Swiss Art Deco Wrist Watches

Materials

18k Gold

Vacheron Constantin Vintage Dress Watch Fancy Lugs Yellow Gold
Vacheron Constantin Vintage Dress Watch Fancy Lugs Yellow Gold

Vacheron Constantin Vintage Dress Watch Fancy Lugs Yellow Gold

By Vacheron Constantin

Located in Mayfair, London, London

A vintage men's dress wristwatch in yellow gold by Vacheron Constantin. Featuring a silver dial with a small seconds display at 6 o'clock and fancy lugs. Fitted with plastic glass, a...

Category

20th Century Swiss Wrist Watches

Materials

Yellow Gold

Rolex Cellini 18K Yellow Gold Men's Watch, Champagne Dial, Swiss Made
Rolex Cellini 18K Yellow Gold Men's Watch, Champagne Dial, Swiss Made

Rolex Cellini 18K Yellow Gold Men's Watch, Champagne Dial, Swiss Made

By Rolex

Located in Queens, NY

Rolex Cellini 18K Yellow Gold Watch, featuring champagne dial with baton indexes and 18K Rolex Crown logo at 12 0'clock, powered by 19 jewel mechanical wind-up movement, worn on wris...

Category

20th Century Swiss Modern Wrist Watches

Materials

18k Gold, Yellow Gold

Rolex Daytona Automatic Chronograph, Ref. 16520, Full Set, 1988
Rolex Daytona Automatic Chronograph, Ref. 16520, Full Set, 1988

Rolex Daytona Automatic Chronograph, Ref. 16520, Full Set, 1988

By Rolex

Located in Antwerp, BE

Rolex Daytona, Ref. 16520, U serial, Full Set from 1998 with Service Papers from 2008 and 2020, with original certificate. Model: 16520 Movement: Automatic Chronograph Zenith Cas...

Category

20th Century Swiss Modern Wrist Watches

Materials

Stainless Steel

Omega Ladies Diamond Yellow Gold Wristwatch
Omega Ladies Diamond Yellow Gold Wristwatch

Omega Ladies Diamond Yellow Gold Wristwatch

By Omega

Located in Stamford, CT

Ladies late 1960's Omega diamond dress wristwatch. Crafted in 18k yellow gold accented with a 24 round cut diamonds along the bezel which are set in 18k white gold. Solid Omega mesh ...

Category

Mid-20th Century Wrist Watches

Materials

Diamond, Gold, 18k Gold, Yellow Gold

Chopard Blue Lapis Lazuli 18K Gold 26mm Vintage Watch Circa 1970s
Chopard Blue Lapis Lazuli 18K Gold 26mm Vintage Watch Circa 1970s

Chopard Blue Lapis Lazuli 18K Gold 26mm Vintage Watch Circa 1970s

By Chopard

Located in Miami, FL

Vintage Chopard unisex watch with a rare blue lapis lazuli dial and 4 asscher cut diamonds. Elegant square octagonal 26mm case with an integral gold mesh bracelet Set in 18k yellow g...

Category

Vintage 1970s Baroque Wrist Watches

Materials

Lapis Lazuli, 18k Gold

Omega Ladies 14K Yellow Gold Diamond Bangle Watch, Circa 1970s, Swiss
Omega Ladies 14K Yellow Gold Diamond Bangle Watch, Circa 1970s, Swiss

Omega Ladies 14K Yellow Gold Diamond Bangle Watch, Circa 1970s, Swiss

$15,072Sale Price|20% Off

H 2.71 in W 0.67 in D 2.44 in

Omega Ladies 14K Yellow Gold Diamond Bangle Watch, Circa 1970s, Swiss

Located in Palm Desert, CA

Ladies Italian 14 Karat Diamond Bangle Watch. The case is 18 Karat and the bangle bracelet 14 Karat. This gorgeous timepiece features thirty prong-set round diamonds on the bezel and...

Category

Vintage 1970s Swiss Retro Wrist Watches

Materials

Diamond, 14k Gold, Yellow Gold, Gold, 18k Gold

Men's Oris Stainless Steel Swiss Automatic Chronograph Exhibition Wrist Watch
Men's Oris Stainless Steel Swiss Automatic Chronograph Exhibition Wrist Watch

Men's Oris Stainless Steel Swiss Automatic Chronograph Exhibition Wrist Watch

Located in Mount Kisco, NY

Enjoy the impressive chronograph dial of this Men's Oris 690 Stainless Steel Artelier Worldtimer Swiss 38mm Automatic Chronograph Wrist Watch. With exhibition case back, you can vie...

Category

Early 2000s Swiss Wrist Watches

Materials

Stainless Steel, Steel

Get Updated with New Arrivals
Save "Bulova Day Date", and we’ll notify you when there are new listings in this category.

Finding the Right Wrist-watches for You

Antique, vintage and luxury wristwatches have captured the hearts and minds of all manner of watch collectors as well as the watchmakers themselves — it's time you found your own.

Certain vintage watches for men and iconic watch designs for women are sought after not only because of their graceful proportions or innovative materials but also because of the illustrious histories of the houses that created them, histories that they stylishly embody.

Bulgari’s legendary Serpenti watch was on everyone’s list after the collection’s bold bracelet, which technically debuted after the timepiece, graced the wrist of actress Elizabeth Taylor. If anything, elaborately crafted timepieces — the unmistakably boxy silhouette of Cartier Tank watches, the elegant and minimal Calatrava designed by legendary Swiss house Patek Philippe — are even more effective than the shape we associate with traditional wristwatches.

Form watches — the all-encompassing moniker bestowed upon non-round watches — are making headlines and completing contemporary fashionable ensembles the world over. At the same time, both casual fans and careful collectors are drawn to the unbeatable charm of vintage styles, such as the icons designed by Omega that even James Bond can’t resist.

In the early days of watchmaking, watches were fragile enough that they necessitated protection from the elements. Now, wristwatches made of gold and steel can withstand the harshest climates — even 100 meters underwater, in the case of Rolex’s Submariner. Designer Gérald Genta, whose range of clients included Rolex, created for Audemars Piguet the first luxury sports timepiece to be made from stainless steel. First introduced in 1972, the Royal Oak was a perfect choice for blending the form and function that are now synonymous with sports watches.

Are you shopping for a wristwatch? It’s good to keep your needs as well as your specific personal style in mind: A smaller, subtle timepiece is a good fit for small wrists. When will you be wearing your new accessory? There’s a versatile model out there for everyday wear, while a rugged, feature-heavy watch is a safe bet if you’re prone to embarking on all-weather activities in the great outdoors.

Find antique, vintage and luxury wristwatches for sale on 1stDibs.