No serial number provided.
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.
Your serial number indicates that you have a Browning light weight auto-5 shotgun that was made in Belgium by FN for Browning in the year 1963.
If your question is about a Browning auto-5 shotgun in 12 gauge,then it was made in the year 1925.If it is a 16 gauge shotgun,then it was made in the year 1929.
If you have a 16ga model auto-5 shotgun? it was made in 1952.
Your serial number indicates that your 16 gauge browning auto-5 shotgun was made in the year 1929.
Your Browning auto-5 shotgun with the prefix of 70s to the serial number identifies that your shotgun was made in Belgium for Browning in the year 1970.
If your auto-5 Browning shotgun is chambered in 12 gauge,then it was made in the year 1924.If you happen to have a 16 gauge model auto-5 shotgun,then it was made in the year 1928.
Your prefix of 1G indicates that you have a Browning auto-5 light weight shotgun which was made in the year 1961.
If we are talking about a Browning auto-5 shotgun in 16 gauge?Then the serial number that you provided indicates that your shotgun was made in the year 1950.
Your shotgun was made in Belgium in the year 1960.That makes it 53 years old.
You Have a Browning auto-5 shotgun that is a Magnum chambering which was made in the year 1968.
Your serial number indicates that your Browning auto-5 shotgun was made in the year 1947.