As with any firearm, it is not possible to accurately appraise a gun without seeing it. Condition, and original configuration will determine value. Other factors such as rarity of caliber or guage and higher grades have significant impact on value. Recommend that you see a local gun dealer for an appraisal. You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List" You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers.
These model 12,s were mostly collected as safe queen,s.That being said your browning model 12 if not fired and in 95% to 100%(unfired new in the box) are valued at 1,000-1675 dollars at this time.
That is not a valid Browning model designation.
It depends on the model
$300-900 depending on condition, which grade, and which model Browning,
Grade 1 BAR made in 1981
need to replace gun stock
This was a Winchester reproduction High Grade shotgun made by Miroku (Browning). 850 were made in 1993 only.
Basically impossible to value with just the model description.
Buy a copy of Fjestad's Blue Book. "Field model" is a general term that is usually used to describe a basic Grade, or standard grade of Shotguns. Sometimes the manufacturer themselves will use the term, such as the Browning Citori Field Model. This would in most all cases be a Grade I Citori. There are hundreds of different Browning Models with variations that it is impossible to quote a value. Model, guage, age and condition are all factors in determining value. Try looking up more specific information in the Blue Book at the link below.
You must add if this gun is a trap model,skeet model,standard model,golden clays model,sporting clays model before we can give you a correct price.Also include the condition of your browning as this will help quit a bit.
Grade 1 BAR = 137, made in 1986
500-800 USD or so