Yes, they all hava a serial number.
your browning auto-5 was made in 1925.
Your browning auto-5 shotgun was made by FN of belguim for browning in 1957.
your browning auto-5 shotgun was made in 1926 by FN of belguim for browning,with the serial number you provided.
your browning model auto-5 shotgun was made in 1924.
If we are talking about a browning auto-5 shotgun,and the serial number is 1M not IM then your shotgun was a standard weight model auto-5 shotgun in 12 Gauge that was made by FN of belguim for browning in 1961.
If your browning auto-5 shotgun is a 12gauge,then it was made in 1927.If you have a 16 gauge shotgun then it was made in 1934.
Being that you said auto shotgun,then you have the Browning auto-5 shotgun that was made by FN in Belgium from 1903-1975.Your serial number indicates that your Shotgun was made in the year 1938.
By the serial number.
Your serial number indicates that your Browning auto-5 shotgun was made in the year 1928.
Your browning auto-5 magnum shotgun was made by FN of belguim for browning in 1965.
With the serial number that you provided,your browning auto-5 shotgun was made by FN of belguim for browning in 1907.
Your Browning auto-5 shotgun with the serial number 73v18957 indicates that you have the magnum version of the auto-5 and that it was made in the year 1973.