I inherited a pistol like all these, but the only thing I can find inside the crane is 3 3294, the same number thats on the frame inside the crane. On the back of the cylinder and on the bottom of the butt strap is C 27805. It is a 5 screw with a 2" pinned barrel. It doesn't have a smooth trigger face. Unfortunately, sometime during my uncles time with the Wash. State Liquor Board, it received a teflon coating. It still shoots great!
C27805 is the s/n.