But that did not mean that Rolex just bought the movements from Zenith and put them in the case. The Zenith calibre 400 was the only chronograph movement with automatic winding that passed all the high Rolex standards for a movement. After 1987, Rolex started using the Zenith El Primero Caliber 400 movement in its Daytona series watches, the most valuable watch. The El Primero Caliber 400 was working so flawlessly that it managed to attract the attention of even a well-established company like Rolex. Excellent Blue Dial and Moonphase - Triple Date Function."Ī limited edition of 1975 was produced to commemorate the model produced in 1975. Therefore it’s called “El Primero”, meaning “The First.” The First Automatic Chronograph Movement. Model: El Primero Triple Date Moonphase 'Limited Edition', In "Excellent" condition.
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