I would start my search at Numrich Gun Parts Corp.They may be found on the web.
Wall Hangers
100-400 USD
50-150 USD
Blue Book of Gun Values
50-125 USD
Depends on condition and features. $75 to maybe as much as $250.
I was offered $500.00 for mine.
Single shots, $50-$75. Double barrel, $150-$250.
HAVE IT CHECKED OVER BY A GUNSMITH FIRST!!!!!!!!!!!! It is an old shotgun.
Stevens 12ga. /mod dhead naught
I HAVE A MODEL 20 12GA BUT NO BOLT, VERY GOOD SHAPE, SELL ME YOUR BOLT OR YOU CAN BUY MY STOCK AND BARREL VERY GOOD SHAPE.
Made for Western Auto Stores. Proofhouse.com has a store brand chart.