a vintage Omega Bumper Automatic, a classic model dating from the late 1940s to early 1950s.Features and Identification This watch bears the typical features of its era, with particular emphasis on the automatic "bumper" mechanism.Mechanism: It is called a "bumper" because the rotor of the automatic winding does not make a full 360-degree rotation. Instead, it moves back and forth and hits small springs (bumpers), which the user can often feel or hear as a light knock on the wrist. Calibers for this model are 332,Dial: It has a sub-seconds dial at the 6 o'clock position. The dial on this watch shows a strong patina (spots due to age), which is highly appreciated by many vintage watch collectors as it adds an authentic character. Reference Numbers: 2398 The watch has been fully serviced by a professional watchmaker, with a new leather strap.