What you have in layman's terms is a S&W military& police revolver in 32-20 Winchester caliber with what appears to be 5" barrel. These were made up until WWII along with its stablemate, the M&P in 38 Special. Winchester and others made rifles and carbines in 32-20 which was fairly popular around 1900, hence the companion revolver. 32-20 ammo doesn't grow on trees, but MidwayUSA has a good selection. Bob!!
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