Value; P. Berretta 20 gauge WWII bring back

Good Afternoon Captian and all GB's- Can not find any info on this one- P.Berretta , 20 gauge, side by side ,double trigger, english style stock, engraved receiver ,serial number 109876, Stahl Fluss on top of barrel dated 1939 - No idea of model or value ,any help is greatly appreciated. Thanks Iowa