It is on the weapon.
If it is marked Light 12, that is an incomplete serial number.
No serial number given.
1965
This is a Light 12 model made in 1970
A shotgun in 12 gauge.
50-500 usd
Your serial number with the prefix of 4G indicates that your Browning light weight 12 gauge shotgun was made in the year 1964.
1962
It was made in 1953
This gun was made in 1955
By the serial number and guage
Impossible to answer without the serial number.