I recently acquired a S&W Model 1-1/2 .32 third issue, serial number 586XX. I'd like to confirm the serial numbers match, but not sure where they are located. I thought the SN was stamped into the inside of the right grip, but mine does not have any number(s). I was told that some models did not have the serial number stamped in the grip. Anyway, can one of you knowledgeable S&W gurus tell me where the SNs are located and should I have one on the inside of the right grip? I appreciate any information shared. Thanks!