My step father has this gun, was trying to date it but from what I can find there should be a 'D' or 'S' in front of the SN but there is not. It is a double action and is not labeled as a '999'. I went on the H&R website but didn't see anywhere to research SN's and it appeared they don't make pistols any more. Also was looking for input on the value. I cleaned it fairly quickly, it will need a through cleaning.