You will have to call Browning with the serial number.
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.
Browning did not make the Model 70, Winchester did. Also, the serial number is not a valid Browning serial number for a 7mm Magnum rifle. Please doublecheck your information.
Your serial number indicates that you have a Browning auto-5 magnum shotgun that was produced in the year 1965.
Your serial number indicates that you have a Browning auto-5 Magnum shotgun that was made in the year 1965.
The letters PY that are in the middle of your serial number,indicate that your Browning Auto-5 Magnum shotgun was made in the year 1982.
It is a Magnum made in 1966.
Your browning auto-5 magnum shotgun was made by FN of belguim for browning in 1965.
This gun is a 12ga Magnum made in 1963.
Check the receiver and barrel.
Where will be marked on the barrel or receiver. When is 1977.