This remarkable wandering hour watch was made by William Knottesford in London around 1670—five years before the invention of the spiral balance spring that made accurate timekeeping possible. See this extraordinary piece and other early English pocket watches on display at the National Watch & Clock Museum. #nawcc #horology #wanderinghour #williamknottesford #watchmuseum #17thcentury #englishwatches #pocketwatch | National Watch & Clock Museum

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