How do I identify Gorham sterling silver?

Art Deco style silver plate ice bucket by Black Starr, includes the ice tong, and original removable pyrex glass insert, as shown. Clean, ready to use, shows only light cosmetic wear...

Austrian Black, Starr & Gorham Enamel copper bowls, Vienna, Set of 2 Offered for sale is a set of 2 Black, Starr & Gorham enameled copper bowl and tray. They are designed in oval and triangular shapes with soft rounded edges and are embellished with black and purple grounds. Additionally, they are decorated with multicolor accents, in yellow, blue, silver, and green colors. They are marked "Black Starr & Gorham" and "Made in Vienna" on their bases as shown. The measurements provided above are for the largest purple ground tray. The smaller purple dish...

A beautiful Art Deco compact by Black Starr and Gorham. It is Sterling Silver with a 14k Gold accent on top, fitted with 3 small precious stones likely rubies. The compact is in est...

This exquisite pair of Art Deco sterling silver candelabras was realized in the United States circa 1930. They feature convex circular hand hammered bases with a dappled texture that...

FACTORY / HOUSE: Black Starr and Gorham STYLE / REFERENCE: Gothic Motif METAL / MATERIAL: Nickle Finished CIRCA: 1940s/ 50s MOVEMENT / CALIBER: High Grade 15 Jewels Swiss Made DIAL / HANDS: Silvered Roman / Filigree Hands DIMENSIONS: 16 Inches tall X 9 Inches Wide / 40cm X 23cm (box 17" X 11") ATTACHMENT: Wall Mount WARRANTY: 18 months on the movement. This is am impressive wall clock sold by one of the premier American jewelry houses. Remarkably it comes with its original box, in excellent condition. Black, Starr and Frost are considered America's oldest jewelry house. They merged with Gorham, one of America's oldest silver companies in 1929. Just in time for the Great Depression. This clock, or rather weather station as it is normally called, appears to have never been used. It was likely made in Switzerland of the finest materials some time mid century. Gothic in style while dating to later part of the Art Deco Era This would be an impressive piece in entry of an elegant old home. Or, conversely it would look great in an ultra modern entry...

Black, Starr & Gorham sterling silver bar cocktail shaker, in Mid-Century Modern style in beautiful geometric design. It measures 8 3/4'' in height by 5'' in width by 4 1/3'' in dept...