Depends on condition. $400-$1000
Go to Browning.com and you can download a manual
YOu must provide the serial number.
50-500 USD or so
The serial number L52789 indicates that you have a Browning light weight model,auto-5 shotgun which was made in the year 1955.
05-500 usd
It shouldn't say light twelve on the barrel, but on the receiver. Light twelve means that the gun is a light weight version of the standard Auto5 shotgun.
50-550 uSD
Browning's web site has a sn search function.
If your browning auto-5 is in excellent condition(85-90%)original finish?I would assign a value of 550-650 dollars.
according to Browning you have a Light A-5 12 ga. made in 1960. Hope this helps
Light-12 made in 1960.
0-300 USD