I just got my hands on an old rifle that belonged to my grandfather. The rifle is a J. Stevens .25-20 single shot lever action rifle. Serial Number 61613. It has a heavy bull barrel which is octagon to the end of the forearm and round the rest of the way. It also has a scope mounted on it which is approx 20 inches long that slides back and forth through the mounting rings to adjust it. I have spent some time researching on the web without much luck. I did see on a old home movie from the 80's where he made mention it was a "1895 with a big bull barrel", but that is it. Any idea how old this rifle may be based on the SN? Any info on these type J. Stevens rifles would be a great help. Thanks.