What Hoot said...

by Murphy , Saturday, December 04, 2021, 22:10 (867 days ago) @ Hoot

Mostly, they're assembly and inspection numbers. The only marking I know of other than the standard serial numbers, is a when there is a star stamped (I believe) on the butt of the frame indicating it has been back to the factory at some point in time for refinishing, or other issues.

Murphy