{"id":322,"date":"2026-07-27T14:28:20","date_gmt":"2026-07-27T14:28:20","guid":{"rendered":"https:\/\/walmawaardebepaling.nl\/?page_id=322"},"modified":"2026-09-08T09:31:38","modified_gmt":"2026-09-08T09:31:38","slug":"het-verhaal-achter-de-walma-mystery-clock","status":"publish","type":"page","link":"https:\/\/walmawaardebepaling.nl\/en\/het-verhaal-achter-de-walma-mystery-clock\/","title":{"rendered":"Dutch inventor of the Mystery Clock"},"content":{"rendered":"

My passion for precision and for appraising jewellery, vintage watches, silver and antiques has its roots in my family.<\/strong> My father, a master instrument maker and inventor Jan Walma<\/strong>, taught me from an early age that true craftsmanship begins with attention to detail, precision and respect for the craft. These values still form the foundation of Walma Valuation Services<\/strong>.<\/p>\n\n\n\n

On this page, I share not only the story behind the famous Walma Mystery Clock, but also the remarkable inventions that preceded it and the technical legacy that laid the foundation for my passion for valuation.
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The First International Invention<\/h2>\n\n\n\n

Even before the development of the Walma Mystery Clock, Jan Walma developed a revolutionary mechanical drive system. 6 November 1956<\/strong> an American patent application was filed. The patent US 2,849,897 \u2013 Drive for a Step-Up or Step-Down Gear<\/strong> was granted on 2 september 1958<\/strong>.<\/p>\n\n\n\n

De uitvinding beschrijft een ingenieuze tandwielconstructie waarmee een draaiende beweging nauwkeurig kan worden versneld of vertraagd. Dankzij de bijzondere geometrie van de tandwielen ontstaat een zeer gelijkmatige, vrijwel spelingsvrije overbrenging. Het systeem was geschikt voor precisietoepassingen, waaronder klokken en andere mechanische aandrijvingen. Er zijn in de Verenigde Staten totaal 2 miljoen exemplaren van verkocht.<\/p>\n\n\n\n

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