Czech inventor Zdenek Jiskra won a bronze medal at the 1937 Paris Fair. And the design and mechanics of the perpetual calendar clock that he won it for are beyond fascinating. The Datumatic table clock shows minutes, hours, the weekday, date, month, and the last number of a year. Through a panoramic window on the […] Visit #TBT Meet The Datumatic, My Only Constantly Running Timepiece to read the full article.

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