1971 model.
You will have to call Browning.
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.
for belgian guns, the serial # that would start 76X xxxx "X" stands for Magnum 20ga. auto5man
You will have to call Browning with the serial number.
Need the serial number to answer.
Check the receiver.
Magnum
Your Browning auto-5 magnum shotgun was made in Herstal,Belgium by the firm FN(Fabrique Nationale)for Browning in the year 1965 with the serial number that you have provided.
You must call Browning with the serial number to find out.
1967
1931
This is a Belgian Browning Lightweight 12 Ga. made in 1965