No way to answer without the serial number.
your browning auto-5 was made in 1927.
your browning auto-5 was made in 1925.
your browning auto-5 magnum was made in 1972.
With the serial number that you provided,your browning auto-5 shotgun was made by FN of belguim for browning in 1907.
The Browning Auto-5 with serial number A 79963 is generally identified as being made around 1926 by FN (Fabrique Nationale) in Belgium for Browning. This would make it a very early Auto-5, which began production in the early 1900s. Because serial-number records for many pre-World War II Auto-5s are incomplete, the exact year should be treated as an estimate. For the most reliable confirmation, you can compare the serial number with Browning’s official historical records and check the markings on the receiver and barrel. Overall, 1926 is a reasonable estimate for an Auto-5 marked A 79963.
your browning auto-5 was made in belguim by FN in 1914.
Your browning auto-5 shotgun was made by FN of belguim for browning in 1957.
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.
If your browning auto-5 was made in 12gauge then it was made in 1925,if your shotgun was made in 16gauge then it was made in 1929.
Your browning auto-5 magnum shotgun was made by FN of belguim for browning in 1965.