The Winchester Model 37A is a single-shot, break-action shotgun produced between 1973 and 1980. While it carries the legendary Winchester name, its history is deeply tied to Canadian manufacturing and serves as a modernized, budget-friendly successor to the original, highly collectible American Winchester Model 37. The Ancestral Model 37 (1936-1963): Introduced during the Great Depression, the original American-made Model 37 was a massive success, known for its ultra-robust "Steelbilt" construction. Over 1 million units were built in New Haven, Connecticut. Winchester discontinued it in 1963 due to rising production costs. he Arrival of the 37A (1973): In 1973, Winchester refined the Model 370 design into a slightly more "deluxe" variant, officially introducing the Model 37A. Nearly 400,000 Model 37As were produced before the Cobourg facility closed its doors in 1979-1980, ending the production run.