Recently picked up a 10-5 2” barrel made mid to late 60’s. Very nice condition conservative 95%. I noticed three notches cut in lower left hand grip just below checkering. I would love to know the story!
Those are simply over-run from the checkering tool, Notice how they are perfectly aligned with three of the grooves in the field. Nothing suspicious, or interesting.
This one is D 323xxx, maybe close. These grips were a local Dominican's attempt to make grips, a story in itself I'm sure. They are better function than appearance. I put the #'d magnas back on so no nitro pills necessary. Joe