This gun was made in 1948. It has the old style front trigger safety.
Your serial number indicates that your Browning light twelve was made in the year 1955.
1954
your browning auto-5 light twelve gauge was made in 1960.
1958
Call Browning.
1979
This gun was made in 1953
@ 33 years old
1960.
You will have to call Browning with the serial number.
1962. sales@countrygunsmith.net
This gun was made in 1963. It is a "Light Twelve" model