Roger, With the serial number you have given, I am going to say that it is from 1899. After 1900 or so the first patent date of Mar.20,'83 would not be on guns made then. If you could post some close up pictures of guns receiver, barrels and the bottom of the receiver it would help in trying to get you a good estimate. If you are unable to post pictures, you can send them to my email address and I will post them. Good luck.