When it was unveiled at the 2012 SIHH, the RM 056 split-seconds competition chronograph sapphire, a limited edition of 5 timepieces, caused a shock-wave in the watchmaking world with its pared down purity, its movement with exemplary finishing and its case made entirely of sapphire crystal. Following this technical feat and determined to continue challenging the very limits of fine watchmaking, Richard Mille has created another exceptional piece for 2013: the RM 56-01 Sapphire Crystal.
The RM 56-01 Sapphire Crystal symbolises all the expertise Richard Mille has accrued in showcasing a caliber through its sheer transparency.
Because the machining of sapphire crystal is an extremely difficult process, the RM 56-01 is only available in a very limited edition of 5 timepieces
CALIBER RM56-01 Manual winding tourbillon movement with hours, minutes, power reserve indicator, function selector and torque indicator.
FUNCTION SELECTOR In a manner similar to a car’s gearbox, the function indicator allows one to see the winding, neutral and hand setting positions as the crown is pulled out. Each position is indicated via a hand at 4 o’clock displaying the following functions: W (Winding) – N (Neutral) – H (Hands).
BASEPLATE, CENTRE BRIDGE AND THIRD WHEEL IN SAPPHIRE CRYSTAL The baseplate has been entirely removed and replaced by large, transparent plates that support the entire movement. The rhomboid crystalline structure of synthetic sapphire crystal Al2O3 has a high melting point of 2,303 Kelvins and a linear-expansion minimal thermal coefficient (6 x 10-6), which combined offer exceptional stability even in the most extreme conditions. Its resistance to abrasion is also eight times greater than that of steel. The third wheel and centre bridge are also made from sapphire crystal. The sapphire crystal of the centre bridge is ribbed to enhance the rigidity of the whole construction, while lightening the structure. All the parts of the RM 56-01 made from sapphire crystal have been treated with an anti-glare coating, and have also been subjected to strict testing to optimise their resistance capabilities.
TORQUE INDICATOR Supplies information about the mainspring’s tension, thus permitting the optimalization of the chronometric functioning of the movement. Below 53 dNmm, the spring is considered to be too slack, while above 65 dNmm, the excessive spring tension can adversely affect the mechanism’s operation, or else actually endanger it. (These indications appear on the numerical zone to the right of the barrel).