Impossible to answer without a detalied description of all features, markings and the serial number.
1957
1971
Browning's web site has a sn search function.
made in 1961
This gun was made in 1961
Browning.com has a sn function under customer service.
Browning.com has a sn function under customer service
Browning.com has a sn search function you can use.
The 4G prefix to your serial number indicates that your Browning auto-5 light weight shotgun was made in Belgium for Browning in the year 1964.
Browning.com has a sn function under customer service
You will need to include the letter or number and letter prefix to your serial number in this question to get a date of manufacture for your browning light weight 12 gauge shotgun.
The serial number prefix of 4G indicates hat you have a Browning auto-5 light weight 12 gauge shotgun that was made in the year 1964.