Most weigh between 6 1/2 lbs to 8lbs depending on the length of the barrel and if it is a Lightwweight or Magnum
The Browning Auto-5 came in 12-, 16- and 20-gauge varieties.
With the suffix of 5Z to the serial number provided,your Browning light weight auto-5 20 gauge shotgun was made in Belgium for Browning in the year 1965.
Your serial number indicates that you have a Browning light weight auto-5 shotgun in 20 gauge that was made in the year 1959.
1925
Your serial number indicates that your Browning standard weight 16 gauge auto-5 shotgun was made in Belgium in the year 1947.
50-600 usd
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.
Anywhere from $350-$1400.
50-500 usd
1940-46
the year was 1959
made 1965.