Superposed shotguns are very collectable when in top condition. Values have a wide range due to so many variations and grades of the Superposed and other Browning Over/Unders. 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. Recommend taking it to a gun shop for appraisal.
Browning did not make a gun as you described
50-550 usd
100-1000 or so
$1,500 - $2,500
Need a detailed description
A gun manufactured by Browning Arms
100-1000 depending on specifics
100-10000 USD or more depending on specifics
Check on line completed auctions or the Blue Book of Gun Values. Not for sale often
50-5000 uSD
this gun was estemated to be worth 500$.
This cannot be answered without a detailed description of the shotguns condition.