Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Recommend taking it to a gun shop for appraisal.
25-200 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.
Pretty much impossible to answer without a detailed description of ALL markings, finish and overall condition
Impossible to answer without a detailed description of all markings, features, box, papers, accessories, etc..
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.
It depends on the browning model of shotgun you are asking about,and the condition it is in.
No such model number ever used by Browning.
Browning never made a model 306
No such model name in the Browning line.