Pretty much impossible to answer without a detailed description of ALL markings, finish and overall condition
$300-900 depending on condition, which grade, and which model Browning,
Basically impossible to value with just the model description.
You must call Browning to find out what grade it is.
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.
Type your answer here... 1400.00
10-400 usd
From completed auctions that i've found with minimal to no use it sells from $1400 to $1500.
AFAIK, Browning never made a model 810.
10-1000 USD depending on specifics
what is the value of a browning sweet 16 no. 51003
Browning did not make a Model 11.
Browning never made a Model 51 shotgun.