Cassell Ltd. National Trust for Historic Preservation. National Jeweler Industry Yellow Pages , updated annually, National Jewelers Industry. Old-House Journal Restoration Directory , updated annually, Dovetale Publishers. Plowden, Anna and Frances Halahan. Sandwith, Hermione and Sheila Stainton.
Additional resources are the state jewelry trade associations for watch and clock referrals.
Also try your local library for books on clocks and watches. This list is not all-inclusive.