If this is not the complete serial number for a Mag 12 Browning. There should be a number and letter above this number to determine the date. Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Auto 5's with recoil pads (other than Mag 12's) poly-chokes and compensators will reduce value. Expect $250-$800 range for this gun. Recommend taking it to a gun shop for appraisal.
Magnum
I am sure happy to help but need more information starting with model or caliber.The 3V prefix was assigned to the browning auto-5 magnum shotgun.Your shotgun was made by FN of belguim for browning in 1963.
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.
Your browning auto-5 magnum shotgun was made by FN of belguim for browning in 1965.
You Have a Browning auto-5 shotgun that is a Magnum chambering which was made in the year 1968.
Your browning auto-5 magnum shotgun with a 0V prefix dates your shotgun to 1960.It was made by FN of belguim for browning that year.FN stands for Fabrique Nationale which is located in Herstal Belguim,near Liege.
1962 auto 5 magnum
The 5V prefix to a browning serial number indicates that your firearm is a Browning auto-5 Magnum shotgun that was made in the year 1965.
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.
The 71V prefix to the serial number indicates that you have a browning auto-5 magnum shotgun that was made by FN in belguim for browning in 1971.