Neat gun Dave. I saw your post on DoubleGun and am aware that Bro. Tom suggested you seek a value estimation on the Forum. The header clearly states that links are not allowed to guns that are for sale, but you obviously are not attempting to market the gun here.
It has "Good 2 Iron" Damascus barrels and was made in 1914
I am concerned about what appears to be deep pitting in the left chamber
Personally, I would only use the gun with 12g chamber inserts, which do afford much more flexibility regarding loads.
And certainly before use the wall thicknesses of the barrels should be measured.