Hi all, thanks Don for your great input with your analysis you do with regards to Brit guns using your rating system. I sure like it. Thanks also Ted and Steve for your input, very thought provoking.
I did some more checking on this gun and it does have both London and Birmingham proofs. I would guess the gun is an original London gun, then reproofed after the sleeving in Birmingham.
If this is so, then Don is right and this was/is a OQ1 (Best SLE) or at least an "A" grade gun.
So...what say you on this?
All the best!
Greg