Your serial number indicates that your Browning auto-5 shotgun was made in the year 1928.
your browning auto-5 was made in 1925.
1933
1969.
1952
your browning auto-5 was made in belguim by FN in 1914.
A visit to Browning's website might answer your question.
Go to Browning's website and use the link they have to determine the manufactured date with the serial number.
Your browning auto-5 wa made by FN of belguim for browning in 1931.
Your browning 20ga model auto-5 shotgun was made by FN of belguim for browning in 1962,with the serial number provided.
1925
Made @ 1930.
1930