Winchester Model 37

The Winchester Model 37 (M37) Single Shot Shotgun is an American firearm. It was in production from 1936 to 1963, with 1,015,554 units made. This model was developed by Winchester with a standard visible hammer action for many years. The Winchester Model 37 uses a top-cocking lever, breakdown type of action with an automatic shell ejector. The first M37 shotguns were delivered on February 10, 1936, according to factory records. M37 shotguns were not serial numbered.