Unfortunately, M37's were manufactured without date stamps or serial numbers.
There are no factory records for the yearly number of shotguns produced from 1936-1963 the entire production run.
The Winchester Model 37 (M37) Single Shot Shotgun is an American firearm.
It was in production from 1936-1963 with 1,015,554 units made.
Options were a 2¾-power scope or a 5-power scope with crosshairs; a 2¾-power scope with a vertical aiming post was added in November of the same year.
Other than the absence of rifling, it was largely similar to the standard model.
Production of the Model 677 had actually ceased in 1938 due to very poor sales.
The Model 677 has the lowest production total of any Winchester single-shot rimfire model with only 1,400 produced.
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.