Hi, I would very much appreciate any help in identifying the actual MANUFACTURER / Country of Manufacture and AGE of this pocket watch movement. The movement is serial number, "54715". The name on the movement is N. P. Kilburn; I found on the Internet that in August, 1862, he came to Corry, PA and was the first jeweler in the town. He sold his business in 1874. The movement is 43mm diameter, as measure just below the upper lip. I presume the movement is 21 jewels. Thank you for any information that you can provide.