It is always hard to tell what is shadow or discoloration of wood in photos, yet readily apparent when the gun is in-hand. The finish wear to the gun is consistant with heavy use, but no abuse. It is entirely possible, but uncommon, that the guns were restocked with a fletch (matching stock blanks). In any event, the wood quality appears to be a good match with the finish and engraving. '98 is not at all too late for a best work flat back. STTF was "invented" early, but did not become fashino until the late '90's to early '00's. Disc set strikers were done, but not always at the time your gun was built. Articulated front trigger is more of a Continental/USA feature. Do you have any idea when your gun came to the USA? Could it have been built for an American?