On the receiver.
your browning auto-5 shotgun was made in 1926 by FN of belguim for browning,with the serial number you provided.
your browning auto-5 was made in 1927.
Your serial number indicates that you have a 16 gauge Browning auto-5 shotgun that was made in the year 1951.
Your serial number indicates that you have a Browning auto-5 magnum shotgun that was produced in the year 1965.
Your serial number indicates that you have a Browning auto-5 Magnum shotgun that was made in the year 1965.
The prefix to your serial number of 70z indicates that your Browning auto-5 shotgun was made in the year 1970.
Your browning auto-5 wa made by FN of belguim for browning in 1931.
your browning model auto-5 shotgun was made in 1924.
No way to answer without the serial number.
With the serial number that you provided,your Browning 16 gauge auto-5 shotgun was produced in the year 1935.
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 magnum shotgun was made by FN of belguim for browning in 1965.