i have this chronometer very rare because made in new york U.S.A.by dillon & tuttle serial number of 640 Google say about him (Thomas Edward Dillon) He left home at the early age of fourteen, and went to Troy, N. Y., where he served an apprenticeship of seven years with Oscar Hanks, at mathematical instrument making. At the expiration of his apprenticeship he left Troy, and went to Albany, where he worked till 1844. In that year he was married to his forst and only wife - Deborah Ann Sharp, of New Baltimore, Green Co., N. Y. He moved with his wife to Brooklyn, L. I., and worked a short time with a firm on Broadway, New York City. After leaving there he was engaged by Bliss & Craton, chronometer makers, in Fulton Street, the same city, and worked with them until 1849 or 1850, when he left to go in partnership in the same business with Calvin Kline. They opened a store in Williamsburgh, L. I., and from there moved to Fulton Street; then to 74 Wall Street, where Mr. D. remained until his death. He finally dissolved partnership with Mr. Kline, and took in with him Mr. Silas Tuttle, un the firm of Dillon & Tuttle. In the fall of '67 Mr. Tuttle retired from the firm, and was succeeded by Edward Openshaw, the firm's name being changed to Dillon & Co.