How do I know what model my Longines watch is?

You can use the serial number of your Longines watch to identify its model. Find the serial number engraved on the back of the case of the watch. With some models, the serial number may be engraved inside the case. You can also send photos of the watch to Longines to get more information on it. Shop a variety of professionally vetted Longines watches on 1stDibs.