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If you want to get a book about English hallmarking, Bradbury's Book of Hallmarks published by the Sheffield Assay Office is a long established reference.
Make sure that you get a 2014 or later edition, because only those contain correct information about British import hallmarks applied to watch cases.
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This page isn't an end in itself, it is intended to help make a start on identifying the hallmarks in your watch case and then lead you to another page with more detail.
On this page there is a brief description of a number of different types of hallmarks that you are likely to find in a watch case, and then for the British and Swiss marks there are links to take you to the full page of information for that type of mark.
Swiss gold and silver watch cases were not hallmarked in Switzerland until hallmarks for watch cases were introduced by law in 1880.
Before that date gold cases were usually stamped with their carat fineness by the case maker, and silver was marked with its millesimal fineness, usually 800, or sometimes just "fine silver".
Swiss watch cases were required to be assayed and hallmarked from 1880 but the identities of Swiss watch case makers are poorly documented before 1925, after that date all Swiss gold watch cases had to be stamped with a mark that identifies the maker.