Keith;
My G @ SN 29,418 has the externally slotted sear adjustment screw. My question to you is What Evidence do you have that it should not have this screw. Where is it written in stone that this should only be on an E grade or higher gun? My best thoughts on the issue is that whether the screw was adjusted from the inside or outside was a time frame thing & the discontinuance of the screw on grades lower than E was a cost cutting feature on the lower grades which came about at some point in time. I would feel it likely that the side plates were probably made in larger batches than were frames & barrels so it would certainly be conceivable that an earlier plate was in inventory & used at a date after the screw had essentially been eliminated. This would not in & of itself necessarily prove it was a plate from a higher grade gun.
My 38,025 FE has chain damascus barrels which also have an E on them. This was my very first Lefever & at the time I just assumed the E was for the ejectors. Eventually I would learn it was not normal practise to stamp ejector barrels with an E. As chain damascus was I believe more commonly used on E grades than F grades, quite possibly this gun's barrels were considered E grade barrels.
