Browning.com has a sn function listed under customer service.
You will have to contact Browning.
Your Browning lightning superposed shotgun was made in the year 1968 with the serial number that you have provided.
If it is a Browning Superposed 12 gauge it was made in 1959.
Your Browning superposed,over under 20 gauge shotgun was made in the year 1951;with the serial number that you have provided.
Basically impossible to value with just the serial number.
Most likely a Superposed.
Browning can tell you how it left the factory, and the gun can be dated by serial number.
The Superposed is an over/under. Check the BPS section on Browning's site for pump shotguns.
HI, the gun was manufactured in 1969, Carl
Browning.com has a sn function under customer service.
100-1000 USD or more.
The name is Superposed. Find this book - Browning Superposed: John M. Browning's Last Legacy by Ned Schwing