We would need to know the model number and other specifications to possibly answer your question. As with any firearm, it is not possible to accurately appraise a gun without seeing it. 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.
200-500 USD
you would need to include if the shotgun in question is a sweet-sixteen auto-5 shotgun,or a browning side by side,or a standard weight auto-5 shotgun and the condition of your shotgun to get a accurate value .
500-1000
100-400 USD
Your browning 16ga auto-5 shotgun was made in 1934 with the serial number that you provided.However the browning sweet-sixteen auto-5 shotgun was not offered until 1937.These sweet-sixteen shotguns were made from 1937-1975.Does your browning shotgun say sweet-sixteen on the shotgun?If so please check your serial number again.
Your browning sweet sixteen auto-5 shotgun was made by FN of belguim for browning in 1957.
Your browning auto-5 sweet sixteen was made by FN of belguim for browning in 1951.
Your browning sweet-sixteen auto-5 shotgun was made for browning by FN of belguim in 1954,with the serial number you provided.
Depending on age and condtion, 100-500 USD.
Your browning sweet sixteen auto-5 shotgun was made by FN of belguim for browning in 1967.
The Sweet sixteen name is the model of your Browning auto-5 shotgun!Is the number 51666 the serial number of your shotgun?Please re-post your question so that a answer can be provided.
Both the sweet sixteen model and the regular production semi auto shotguns were Browning auto-5 shotgun models.The regular Browning auto-5 shotgun had engraving on the receivers just like the sweet-sixteen.