You will have to call browning with the sn to find out.
Your browning sweet sixteen was made by browning in 1954.
made in 1958
your browning auto-5 was made in 1951.
It was made in 1957
1924
Browning never used the letter B prefix to there serial numbers.
You must call Browning.
1950
Made in 1924.
Made in 1929.
Made in 1924.