50-400 or so
An Ithaca model 51 magnum 3 inch shotgun is worth $275-$325, depending on condition.
You can find information like age and the worth of a product on a J.stevens Arms and Tool Co browning pat from the info engraved on it.
At most about $35.00 if it is in good condition
That depends on which model it is and in which country you are trying to sell it.
50-500 usd
The year made is 1939. What kind of shape is it in? If original with good bluing and good wood, you'll do ok with it. Depends if it is a field model or trap? Is it engraved? What type of presentation model.
In July 2015 an unfired specimen in bright nickel with original box, papers, accessories sold on Gunbroker for $3,250.
Requires professional appraisal
100-500 USD depending on specifics
About $300-$450, depending on condition.
too much
Stevens model 67 e 12Ga is worth $75-125 +\- 10% for condition and age