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it features a classic and timeless case
Its sculpted tonneau case flows smoothly into the integrated bracelet like the body panels of a classic road-racing machine
Timing: Timed to precision in five positions on a state-of-the-art computerized system
Movement type: Caliber 550/552
blackened and whitened steel batons with blue seconds
1973 IWC Large Vintage Mens Caliber 150 Electronic Tuning Fork Watch - Stainless Steel Constellation it features a classic andToday's offering features this very cool and rare IWC caliber 150 watch. For the movement the company used a patented tuning fork based movement made by ESA. These watches use a battery driven tuning fork whose vibrations are converted by a special index mechanism into an almost smoothless rotary motion of the hands. At the time, tuning fork watches were the most accurate timekeeping mechanisms ever devised. The tuning fork technology was so accurate
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