I tend to believe the "73" is actually a "B", also. I have owned a J. Hayden, Oxford, Ohio rifle. The name on mine was stamped. The rifle was a very pronounced tiger striped maple (real, not artificially striped) halfstock, with a back-action lock. Believe it or not, one of the finest Ohio rifles I have ever seen was a cased target rifle by J. Hayden, Oxford, Ohio. It was pretty well covered with silver. I would be surprised if Blemus and Joseph were not related. I also have a prominent gunsmith in Monmouth, Illinois, named David S. Hayden, who came from Ohio in March of 1858. He was the younger brother of Joseph, and learned the trade from him. There are also at least two rifles known, stamped "J. Hayden, Galesburg, Ill." One of them came from the estate of D. S. Hayden, the gunsmith in Monmouth. The "J. Hayden, Galesburg, Ill." stamp was also found among David S. Hayden's tools. I am not sure who this "J. Hayden" was, but he was listed as a gunsmith in Illinois State Gazetteers 1884 -1888. D. S. Hayden did not have any sons with the initial "J".