Go to the link below for a download
You can request a owner's manual on the Browning web site. It also has sn data.
http://www.browning.com/products/manuals/index.asp
You moght find one at Browning own web site,if not I would try gun broker.com,or e-bay.
Your serial number indicates that your Browning light twelve was made in the year 1955.
Good shotgun
your browning auto-5 light twelve gauge was made in 1960.
Readily available from Browning.
your browning light weight 12ga was produced in 1960.
This is a Browning Auto-5 Lightweight 12 gauge shotgun.
You will have to contact Browning to find out.
The value of such light is approximately $10,000
You will have to call Browning with the serial number.