Weight of the weapon.
Go to Browning's site, click on Support then date your firearm.
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.
A shotgun.
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.
Your serial number indicates that you have a Browning light weight auto-5 shotgun in 20 gauge that was made in the year 1959.
The prefix of 5Z to your serial number indicates that you have a Browning auto-5 light weight shotgun that was made in the year 1965.
With the serial number that you have provided,your Browning light weight model Auto-5 shotgun was made in the year 1958.
No such model name in the Browning line.
What is it you are asking?
100-1000 USD
65-550 usd
100-2000 usd