1968
Answer 1958 - It was the first year of the 12ga Magnum.
you have a magnum 12 made in 1966 auto5man
1971 model.
It will be marked if it is Belgian made.
you have a 12ga Magnum made in Herstal Belgium by Fabrique Nationale in 1969. FN was the manufacturer of all belgian Brownings. auto5man
The 4V prefix to your serial number indicates that you have a Browning auto-5 Magnum shotgun made by FN of belguim,in the year 1964.
That is an Auto-5 'Magnum Twenty' made in 1969. In excellent condition, they can reach $1400.
Your Browning auto-5 magnum shotgun was made in the year 1960.
It is a 12ga Magnum made in Herstal Belgium in 1962.
You will have to call Browning with the sn to find out.
You must call Browning.
The barrel will be marked "Made in Belgium"