I have a regular looking un-fired round with the following headstamp: R-P 32S&WL. Someone etched on the side with an etching gun: GW 2-7-76. Any guess what happened here on that day? I was still living happily in the USSR praising Great Communist Party and wise Vladimir Lenin. Come to think of it, let me call my friend Hugo Chavez.
Police evidence (empty cases or loaded rounds) in criminal firearms cases are marked like this, with the officers initials & date found marked on the casing.
(Wisconsin State Crime Laboratory brochure info.)