" Horology " trivia ... a collection

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This might be a bit of a "nerdy" topic, so forum admin may delete if they consider it inappropriate !
As the titel suggests " Horology " trivia would list up interesting facts sidetracked from the horology world.
Who knew Perpetual Calendars will have a calculation problem for the year 2100, or that Hitler's chauffeur was a watchmaker by trade, or the amazing journey of saving Larcum Kendall's K2 chronometer after the mutiny on the Bounty 1789...
Who knew the control cables in the Lockheed A12 Oxcart were made of Elgiloy, a steel, chromium & nickel alloy used in wrist watch springs...
Who knew Bahne Bonniksen, inventor of the Karussel watch movement, constructed Speedometers for the British Brough Superior motorcycles...
this kind of triva thus...