Need a value guesstimate Browning B 25 28 ga

Local gun store had a guy drop off a B 25 in a nice custom shop case.
28 gauge, 30" barrels.
Case colored frame w Minimal engraving. No gold
Amazing wood w oil finish.
Ser # 324MW
043XX
Need some guidance as I can't find info on the 28gauge shotguns.

CP