For the upcoming Only Watch charity auction Vacheron Constantin unveiled this unique piece Métiers d’Art Mécaniques Ajourées. The 18K white gold case measures 40 mm diameter, 7.50 mm thick , and features a transparent sapphire crystal caseback. Celebrating the charity event, this unique piece Métiers d’Art Mécaniques Ajourées demonstrates once again the full extent of their expertise, the in-house enamelling – it comes with a Red Grand Feu opaque enamelled external ring, Openworked Roman numerals on an 18K gold ring “Only Watch” openworked on the 18K gold ring, at 3 o’clock. 
The timpiece is powered by the manually-wound openworked Calibre 4400SQ, developed and manufactured by Vacheron Constantin, with 21 jewels, beating at 4Hz (28’800 vibrations/hour) and a power reserve of 65 hours. The novelty is completed by a black Mississippiensis alligator leather strap with alligator leather inner shell, stitched-tip, large square scales with 18K white gold buckle.
[ Source: Vacheron Constantin ]
