Guy walks up with his father's revolver and after a short negotiation period he left it with me. C90591, which I believe came out of the factory around 1948.. I know Jack and others can narrow it down for me. It's got a few scuffs and freckles but mechanically it is great. Another testament to S&W's post war quality, without the high polish that came a little later. I personally like the satin post war blue for a self defense gun.