https://grabcad.com/library/smith-wesson-chiefs-special-38-spl-model-36-ca-1950-1
Smith & Wesson "Chiefs Special", Model 36, caliber .38 SPL, barrel 3", frame type J.
The Chiefs Special was the first 5-shot J-frame .38 Special revolver produced by Smith & Wesson. I would be willing to suggest that it is the most influential compact revolver design of the 20th Century.