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We have seen quite a few skull watches introduced recently. The Richard Mille Tourbillon RM 052 Skull watch, introduced at SIHH 2012, is among the most complicated currently.
A few bridges that connect the movement towards case, and represent the dial, are arranged in the "skull-and-crossbones" pattern inspired by flags from pirate ships. Top of the minimizing "jaws" hold the ruby on the tourbillon cage, plus the back from the skull can be the movement's center bridge. Functions includes hours minutes and tourbillon seconds. Skeletonized hour and minute hands. Luminous treatment on hour hand, big hand and indexes.
Richard Mille caliber RM 052 is really a manually wound tourbillon with 19 jewels, a Glucydur balance with four setting screws, 21,600 vph (3Hz), Elinvar by Nivarox balance spring and Kif Elastor KE shock protection and power reserve 48-hour power reserve. Finishing includes micro-blasted milled sections, hand bevelled surfaces and drawn or polished outer faces.
The tripartite tonneau titanium case, assembled with 20 spline screws in grade 5 titanium, measures 42.7 mm x 50 mm. The top of flange is in carbon, the lower flange is grade 5 titanium with DLC coating. Sapphire crystal back and front with anti-glare coating. The tripartite case requires 255 machining steps, including 86 stamping operations. The way it is uses spline screws in titanium for greater torque control, and contains a torque-limiting crown, a different security feature to stop accidental overwinding.Patek Philippe Complications 2013 NEW Watch 5205R-010