tiger, I'm going to offer some observations based on the photos. Please understand that I'm well aware that photos and gun in hand are different.
The deal case does not go with a gun of this quality. The case appears to me to be relined. The finish on the barrels and on the stock and action don't seem to really go together. I suspect the action has been refinished recently, as has the stock.
Green has Brand Value three (BV3). The Original Quality grade looks like "A" grade; maybe OQ4. I'm going to speculate Current Condition level at five (CC5 = Minor repairs needed or proper restoration accomplished).
BV3-OQ4-CC5 = $2,400. You might bump that 25% for 16 gauge, maybe.
Unfortunately, I do not have enough comparables to claim a high level of accuracy. Please let me know if you disagree with the above. Anyone have comparable guns with known sale prices?
DDA