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Priestley's "Watch Case Makers" American Hallmarks? German Hallmarks • Pforzheim French Swan and Owl Russian Hallmarks Polish Hallmarks British Sponsor but No Hallmarks?
If you want to get a book about British hallmarking, Bradbury's Book of Hallmarks published by the Sheffield Assay Office is a long established reference.
These are not hallmarks; they depend to a large extent on the manufacturer's honesty.
American watch cases usually carry the maker's name and trade mark.
There has never been a system of hallmarking in America.
Watch cases made in America carry marks stamped by their makers that were not legally mandated or controlled until 1906 when the National Gold and Silver Stamping Act required an accurate purity mark.