Thank for all the feedback.
The lock is a fairly new production I believe. This one and a Small Siler flint look brand new and were supposedly purchased in the last year or so.
The other two are an older Siler large flint and an RE Davis English percussion (I think that's the name &brand).
The M&G looks alot to my untrained eyes like a Siler with a bit smaller plate. Seems like a nice lock. Nice and smooth. Not quite the flat polish finish inside as the Silers. The pan & frizzen fits perfect all the way around ..except! for one small area on the off side. A little fitting will take care of that.
None of the locks has ever been drilled for side plate screws.
The Large Siler F/L is an older pattern? I'm learning,,I'm told they changed some lock geometry to improve performance at one time and this is the 'older' style.
It & the Davis have been knocking around in storage in a shop for a while. But other than some finger print & light surface rust spots and the like, they look unaltered.
The M&G and the small Siler flint look like new,,just missing the packing matr'l.
I may be able to buy some other M/L builder parts from the lot if things go right.
Guess I better start some new projects.
Thanks again, I appreciate the knowledge here.