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IWC - Aquatimer Perpetual Calendar Digital Date Month ref. IW379401

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We recently presented three models of the new 2014 Aquatimer line that IWC will present next week at the Salon International de la Haute Horlogerie in Geneva. We have now another preview with the Aquatimer Perpetual Calendar Digital Date Month.
The huge case has a diameter of 49 mm, a measure which makes this reference the second largest watch ever created by IWC, just after the Big Pilot's Watch 52 T.S.C. - dating back to 1940 - whose diameter was 55 mm. The case height is 19 mm.

The casing ring is made of rubber coated titanium with the external rotating bezel in red gold. The case back is in red gold with a sapphire glass to showcase the in-house self-winding movement, the calibre 89801, which beats at 28,800 A/h (4Hz) and offers 68 hours of power reserve.

Features include a perpetual calendar with large double-digit displays for both the date and month, a leap year display at 6 o'clock integrated in the small seconds sub-dial and a flyback chronograph with hours and minutes counter at 12 o'clock. The watch is water resistant to 100 metres.
The energy required to advance the month display discs is built up continuously throughout the month by a quick-action switch. A spring-loaded lever on the quick-action switch is lifted a tiny bit further each day by a cam. At the end of the month, the energy is released and the quick-action switch jumps instantaneously to its starting position and advances both of the month display discs individually, or together, by one position, depending on the month. On 31 December, the leap year disc is also advanced at the same time.

The black rubber strap with alligator leather inlay benefits of the IWC quick change system.

The IWC Aquatimer Perpetual Calendar Digital Date Month (ref. IW379401) is a limited edition of 50 pieces.

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