In 1809, Seth Thomas joined with Eli Terry and Silas Hoadley in a partnership in the manufacture of clocks in Plymouth Hollow, Connecticut. After one year, Thomas and Hoadley bought out Terry's interest in the business. in 1812, Thomas sold his interest to Hoadley and opened his own shop in Plymouth Hollow. It was successful. The Seth Thomas company was incorporated in 1855.
Five volumes of the Seth Thomas Clock Company's records, including a journal, two minute books, a sales and cash receipts record book, and a stock record book.
Seth Thomas Clock Company Records, 1835-1928, Archives Center, National Museum of American History