Vacheron Constantin launches a extreme complicate tourbillon watch-The Maitre Cabinotier retrograde armillary watch. It was produced by the three master watchmakers who created Ref. 57260.
The manually wound calibre 1990 movement developed and manufactured by Vacheron Constantin features retrograde hours and minutes indications with instant flyback. The hands flick back to zero at such a speed that the special attention is needed to ensure a precise indication and such lightweight and resistant materials as the titanium used in the hands.
The elegantly structured armillary tourbillon operates as asphere perpetually rotating on two axes under a sapphire crystal dome at 9 o’clock. It’s called an armillary tourbillon because it is based on an armillary sphere like the one incorporated in an astronomic clock made by the French clockmaker, Antide Janvier, in the 18th century. The spherical balance spring, which was first developed by Jacques-Frédéric Houriet in 1814, is particularly rare in today’s watches. The shape ensures the concentric development of the spring and consequently the isochronism of the balance wheel. The tourbillon carriage, made of lightweight aluminium alloy, incorporates Vacheron Constantin’s Maltese Cross emblem, which forms up every 15 seconds as the tourbillon rotates. This ongoing spectacle may be admired every 30 seconds through a sapphire crystal opening on the side of the case.
The armillary tourbillon achieves remarkable timekeeping precision. It is fitted with a new type of escapement, developed and made by Vacheron Constantin that has the escape wheel and lever in silicon with diamond pallet stones for resistance to wear and long life. The escapement, made as lightweight as possible by the use of high-tech materials, contributes significantly to the performance of this watch, which greatly exceeds the requirements of the Swiss Official Chronometer Testing Institute (COSC).