As I noted in my OP, normally I see cartridge abbreviated as "ctg.". The fact that it's in Capital letters and with a period after each letter would lead me to speculate that it's an acronym for something. No one on the S&W forum has been able to come up with a suggestion either. Without question, the stamps were applied by some sort of club or organization post production. It's a real head-scratcher. If I ever find out the origin of the stamps it may or may not add value to the pistol, but for me, it's more solving a mystery.
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