Browning.com has a sn function under customer service
The model number of the gun and make along with the serial number usually will determine the age of a gun.
By the serial number.
Where did you get that gun?
Serial number tables, if published
You are going to have to identify the model number to determine the age. Take the gun to a gun shop or gun smith for assistance.
The letter of the given serial number indicates the year the gun was manufactured. In this case, the gun was made in 1960.
Find books on the maker.
1977
4092
The gun were made in 1906.
You will have to call Browning to find out.
It is not possible to determine the age of a Mod 12 with serial number 83876 without additional information. The serial number is typically used for identification and tracking purposes, not for revealing age.