fine damascus the continental 12g. shotgun

hi, have this old gun and dont know anything, has pat jun 1883 on it and has SJ&O under barrel relase lever. two triggers with rabbit ear hammers. lots of engraving, serial number is 21313 . HAS ALSO APRIL MARCH JUN LOOKS LIKE 1883 OR 1887. HARD TO TELL.also has looks like maker marks near serial number. can take digital pics, we were just wondering about real age and anything else . thanks for your time. [This message has been edited by jojot (edited 03-01-2002).]