All things considered, what do you think a Parker Reproduction 20 Ga. 2 Barrel Set as described below should sell for:

New in original leather case and dust cover-Never Fired or handled
20 Gauge
2 Barrel set 26" IC/M 28" M/F
Pistol grip/Beavertail
SST

$5500 low end-$6500 high end.
Bob Jurewicz

From my recent looking around, I'd say that beavertail forend is a bit on the rare side and therefore may command more toward the top end of the range or even a bit more if the seller is looking for top money (all other things being equal).