Accepted Brands

• Adams & Perry Watch Co - Hamilton predecessor
• American Waltham Watch Co - first factory watches
• Appleton Watch Co - successor of the Cheshire Co
• Auburndale Watch Co - maker of the rotary design
• Aurora Watch Co - absorbed into the Hamilton Co
• Ball Watch Co - founded by Webster Clayton Ball
• Boston Watch Co -  early Waltham incarnation
• Cheshire Watch Co - based on Waterbury designs
• Columbus Watch Co - founded by Dietrich Gruen
• Cornell Watch Co - successor of the Newark Co
• Dudley Watch Co - designs with Masonic symbols
• Elgin Watch Co - produced over 50 million watches
• Fredonia Watch Co - successor of the Independent Co
• Hamilton Watch Co - regarded as the accuracy standard
• Hampden Watch Co - first to offer a 23-jewel watch
• Howard, Davis & Dennison - founders of Waltham Co
• Howard Watch Co - founded by Edward Howard
• Illinois Watch Co - successor of the Springfield Co
• Independent Watch Co - predecessor of the Fredonia Co
• Keystone Watch Co - predecessor of the Hamilton Co
• Lancaster Watch Co - Keystone Co predecessor
• Marion Watch Co - re-organized United States Co
• Melrose Watch Co - successor of the Tremont Co
• Mozart Watch Co - two versions started by Don Mozart
• Nashua Watch Co - parallel spin-off from Waltham
• National Watch Co - Elgin before changing their name
• Newark Watch Co - founded by Nap Sherwood
• New York Watch Co - predecessor of the Hampden Co
• NY Standard Co - worm-gear escapement
• Non-Magnetic Co - watches with Paillard's hairspring
• Otay Watch Co - successor of the San Jose Co
• Peoria Watch Co - made watches for Non-Magnetic Co
• Philadelphia Watch Co - founded by Eugene Paulus
• Rockford Watch Co - marketed to railroad personnel
• Seth Thomas Watch Co - New England clockmaker
• Springfield Watch Co - predecessor of the Illinois Co
• South Bend Watch Co - formed by Studebaker Bros
• Tremont Watch Co - founded by Aaron Dennison
• United States Co - started by NY jewelers Giles and Wales
• US Watch of Waltham - a spin-off from Waltham
• Waltham Watch Co - founders Howard, Davis & Dennison
• Warren Manufacturing - Waltham predecessor

This is not a complete list, but any interesting and well-made piece will be considered. Parts for any non-domestic brand are naturally difficult to find, so only high-grade pocket watches in exceptional condition will be accepted.

• Agassiz - predecessor of Longines
• Audemars Piguet - high-grade Swiss maker
• Borel & Courvoisier
• Bulova - founded by Joseph Bulova
• Cartier
• Dent - English firm that made Big Ben
• Frodsham - London father and son team
• Girard Perregaux - Swiss maker of tourbillons
• Gruen - Begun by Columbus founder Dietrich Gruen
• Hebdomas - maker of 8-day models
• Huguenin - Swiss brand purchased by Hamilton
• International - American company in Switzerland
• Jules Jurgensen - Early family-owned Swiss brand
• A Lange & Sohne - German factory destroyed in WWII
• Le Coultre & Co 
• Lepine - founded by Jean-Antoine L'Epine
• Longines - Swiss company still in business today
• H Moser & Cie
• Ulysse Nardin
• Non-Magnetic Co - Swiss half of the American firm
• Omega - founded in 1848 and still in business
• Patek Phillipe - high-grade Swiss watchmaking duo
• Potter - New York watchmaker who moved to Geneva
• Roskopf
• Tissot
• Tobias, M I & Co - London family company 
• Vacheron & Constantin - oldest Swiss firm, in 1775
• Zenith