Benelli Blow back (Help)

Hello guys.I have a question I hope someone will help me on.I have a Benelli Armi brand 12 Gage shotgun. It holds 5 shells and is in mint cindition. The sides of the recievers have a hunting motif carving, and the stock in hand checkered. Barrels ar H&K. The model (I think) is 123 SL-80.Serial# 148059. Any idea on value ??