Browning never used the prefix letter B on any of there shotgun,s serial numbers.
Call Browning with the sn and they can tell you.
This is an Auto-5 Browning made in 1953
1947
Your browning was made in 1976.
1947
You will need to call Browning.
your browning auto-5 shotgun was made in 1926.
your browning auto-5, 16ga shotgun was produced in 1947.
The manufacture date of a Browning Auto-5 16-gauge depends on its complete serial number and markings. For an accurate date, check Browning’s official serial-number records or contact Browning directly for verification.
Your browning magnum auto-5 shotgun was made by FN of belguim for browning in 1964.
No serial number provided.
1976