VH 12 with Briley thin-walled tubes

[Grantham Forester]

So, as the book I have is 4 years ago, would that same VH 12 (given accurate condition today) be worth more than $4000 in today's market. The same person also has a AH Fox 12 Grade A- same specifications as the VH 12 (double triggers, standard extractors) but without the added Briley choke tubes, and more as 90% condition- not refinished. I realize this is a Parker based website, and not geared to the Fox guns per se, but the same 2010 Blue Book shows this Fox gun at about half the value of the VH-

I tend to agree that in spite of the expense the owner incurred for the Briley chokes- installed into uncut-down barrels, that might make the VH less "original" and worth a bit less that this Blue Book indicates??

Many thanks to all who have answered my posting, lot of good solid data and insight here, all for the asking!!