Limited to 10 models, this Vacheron Constantin ultra-thin grand complication chronograph is the pièce de résistance of the new Harmony collection. Billed as the world's thinnest, self-winding, split-seconds chronograph, at 8.3mm, the ultra-slim, polished, cushion-shaped platinum case houses a wonderful chronograph function. The mono-pusher chronograph is infinitely more elegant that a dual pusher and considerably harder to develop, while a separate pusher at 2 o'clock operates the split seconds function. The elegant white dial features navy blue Arabic numerals encircled by a red tachometric scale. The chronograph hours and minutes sub-dials are located at 3 and 9 o'clock, while the power reserve of 51 hours is indicated at 6 o'clock. The in-house made automatic movement, calibre 3500, has an exquisite gold peripheral oscillating weight. An elegant, refined timepiece, this grand complication chronograph is worn on a navy blue alligator leather strap.