Ira Patchen was trained as a gunsmith in Bath, NY and he moved to Covington, Tioga County, Pa in 1837 to open his gunshop. He was a farmer as well as a gunmaker "and a prominent Odd Fellow "... his wife Christina was the daughter of General Thomas Putnam. Interestingly in 1880, Patchen was the neighbor of Josiah Harding in Covington who made similar over under guns with both a back action lock and also an "under hammer lock". You've got a nice, typical gun by Patchen which, unfortunately is missing the spring steel trigger guard that also serves as the mainspring for the underhammer. Most probably the barrels are lightly stamped by the commercial barrel maker "B. LOSEY" near the breech
*** I removed the gun shown below thinking it was an underhammer which is against our rules. Actually its both a sidelock and an under-hammer so I guess it halfway meets our rules :) so I am putting it back with the sidelock side showing. Dennis ALR Admin***
(https://preview.ibb.co/mGmdfL/Screen-Shot-2018-11-14-at-10-07-26-AM.png)