Just curious, when you state- "Depending on who did the work, and if that can be verified".. A recent trip to a Cabela's-BassMasters-Pro-Shop found a "Del Grego redone 12 bore Parker DHE- offered at about 5K-if memory serves. Indeed, fine looking wood finish, barrel blue and color case hardening- all screw heads "indexed"-- DT, AE 28" Titanic barrels, Skeleton BP-- all the DHE "Bells and Whistles"--
So just out of curiosity, I asked the young sales "associate" if they had a letter from DelGrego with the sn of the gun indicated on the bill for the work purportedly done by Del Grego-- He went back to the office to check with his boss- and came back and said- "No- but the person we bought it from told us that it was done by Mr. DelGrego"!!
Huumm- if I were writing that size of a check, I'd want better verification than just the "kind word of a stranger"-- maybe yes, maybe no- I'm no expert--
A hunting friend has a older 12 VH Parker- 30" Vulcan barrels, and he had Teague chokes installed (and has the attendant paperwork)- and after a walk-up shoot together, and the guns open and unloaded, he had me look down the tubes from the muzzle end- and sure enough- you couldn't see any sign of that precision work-- as to "re-sale" value, not an issue, as he doesn't plan to sell it-- RWTF