You probably have to post a photo to get meaningful comments.
I have a Browning Citori O/U. They are made in Japan and at least at one time were considered to be the poor man's version of the Browning O/U. The definition of "poor man" may have changed... In any case it works well, and that is all I care about.
The more desireable version is the Belgian Superposed. If you have that type, depending on the grade and condition it could be fairly valuable.
Have a look at this link and see if anything you see is a match.
http://www.collectorsfirearms.com/ad...D=1&subcatID=2
Ron