Thank you for responding to my questions. The # on the bottom of the grip frame is 76J868. There is a # on the left side of the grip frame, stamped in the non-polished part, of 45280, also with the letter N and G12 stamped on it. On the other side of the grip frame there is a letter Z in a circle and a letter C in a triangle. Everything is hidden by the grip. Thanks again for your response, your info is valued. This firearm was used by my friend as a back up revolver while He was a Michigan State Trooper. This firearm will remain in my collection and will be handed down, as should be, to my Daughter. My Daughter understands firearms and on a good day she MAY be able to out shoot the Old Man. Nah. Anyway, any and all info will be valued for there is a story to be told. Thank you, Bob