Is there anyway to approximately date a GB movement with the above stamped in the back plate? The owner is not sure how old the clock is but it has been in the family for two generations. Other than being dirty and a bit worn, the only obvious problem to be addressed is the pivot hole for the center shaft in the back plate. It has been punched a bit and the pivot will need some cleanup and polishing. My question is when you encounter a punch like this do you put in a large enough bushing to completely remove the punch marks, or do you sometimes put in the smallest possible bushing that handles the pivot properly? I kind of hate to send it home with punch marks still showing, but don't want to ream out more than necessary if leaving old punch marks in place is usually acceptable.