I have an SKB made Ithica M500 12ga O/U field grade shotgun that I am considering selling. Overall in it's in very good shape (90% or better) and has hardly been shot since I bought it used, 15+ years ago. I am looking for a ballpark guess-timate on what my asking price should be private sale or what I might expect if I trade it at the local shop. Thanks in advance for any assistance.

$500-$600