You have discovered a ".22/32 Kit Gun Airweight Model of 1955" which became the Model 43.

It's built on the J frame only with sq butt and 3 1/2" barrel. The frame and cyl are alloy. They aren't nearly as plentiful as the all steel kit gun; the Model of 1953/Model 34 built on the new I frame and not until Oct 1960 on the J frame.

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Jim
S&WCA #819