Take it to a local watchmaker (probably not the guy in the Mall who changes batteries) and get him to unscrew the caseback.
Take sharp photos of the inside of the caseback and the movement, showing the model number, the movement number and the serial number.
Take sharp photos of the watch face, case, lugs, bracelet and clasp.
Post the photos here and tell us how you came by the watch and whether or not it runs.
馃榾