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Positioned concentrically one inside the other, each spring has its own diameter, but both supply the movement with identical torque. Expanding and contracting in an antiphase (while the first spring expands, the other one contracts,) this design ensures better isochronism thanks to a much flatter effective torque diagram. According to the Swiss maker of expensive writing instruments, this is the first wristwatch that employs such a design. Previously it was used only in much larger maritime chronometers. Montblanc plans to produce the watch in a number of limited edition versions, including one in platinum 950 (pictured,) as well as in 18-carat white and rose gold.
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