Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin Skeleton Blue
After steel comes gold as Vacheron Constantin offers up a new version of their “Overseas Perpetual Calendar Ultra-Thin” with a skeleton blue dial. Once again the master craftsmanship of this historic watch manufacture is on full display here. From jampacking multiple complications within a slim thin encasing, to revealing those ticking gears with a skeletonized front and back.The 41.5mm case is made of 18k pink gold with vertically brushed surfaces and polished finished accents, while the “ultra-thin” designation derives from its mere 8.1mm thickness. 
Mounted to the case is a notched bezel that can be seen as evoking the shape of a Maltese Cross, the emblem of Vacheron Constantin.
On the flip-side is a sapphire exhibition caseback that allows a view into the mechanical movement. It showcases an open-worked caliber with the rotor and bridges treated in gray ruthenium.
It comes equipped with a knurled setting-crown adorned by the Maltese cross, with small push correctors to each of its sides, to adjust the perpetual calendar as required. All topped by a sapphire crystal that assists with water-resistance reaching up to 50 meters (164 feet).
Time is exhibited on a skeleton dial with 18k pink gold applied hour index markers, followed by a sloped flange with a blue 60-minute scale ring.
The perpetual calendar is spread out on four sub-dials: the date at 3 o’clock, current day at 9 o’clock, and month at the 12 o’clock position, which includes the months of the leap year.
Meanwhile on the lower-half of the dial is a finely detailed translucent two-layer moon-phase sub-dial, aligned at 6 o’clock. 
The central sword-shaped pink gold hands and hour index markers have all been fitted with a luminescent coating, for an enhanced legibility.
Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin Skeleton Blue
The “Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin Skeleton Blue” (Ref#: 4300V/120R-B642) is powered by the in-house self-winding mechanical movement, caliber 1120 QP/1 with 36 jewels, 276 parts, and 19,800 vph. It comes equipped with a free-sprung and adjustable balance wheel. Power reserve on this watch can last up to 40 hours, when fully wound.
Mounted to the watch is an 18k pink gold bracelet, secured by a triple-blade deployant clasp. This bracelet features a micro-adjustment mechanism that can provide an extension of up to 2mm on each side of the clasp.
It also comes with an additional blue rubber and dark blue calf leather strap, both secured by a pink gold pin buckle.
For more up to date information visit the official Vacheron Constantin website here.
