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. Condition and age is also a factor. Auto 5's with recoil pads (other than Mag 12's) poly-chokes and compensators will reduce value. Recommend taking it to a gun shop for appraisal. You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List" You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers
60;100-500 uSD
500-1000
The PZ found in the middle of your serial number indicated that your browning light twenty auto-5 shotgun was made by browning in 1981.
$350-$650
$350-$850
50-500 usd
50-500 USD. Browning will have to tell you the age.
Browning Auto-5 'Light Twenty' made in 1967. Value from $450-$1000.
50-500 usd
0-300 USD
50-400 usd
50-350 usd