Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin
All these recent releases by Audemars Piguet got me wondering about other sports watches with integrated bracelets worthy of attention. Tourbillons are a unique complication, but a perpetual calendar is far more useful for daily use. All this made us recall last year's “Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin” released in white gold, after previously only being available in a pink gold option.The 41.5mm case is made of 18k white 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 a 22k gold compass-rose rotor (blue dial), 
while the skeleton dial option has an open-worked caliber with the rotor and bridges treated in grey 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 sap[hire crystal that assists with water-resistance reaching up to 50 meters (164 feet).
Time is exhibited on either a skeleton dial or a lacquered blue dial finished with a sunburst brushed finish. Both feature white gold applied hour index, followed by a sloped flange with a blue 60-minute scale ring. 
The perpetual calendar is spread out on four snailed 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 (skeleton dial). 
While the blue dial version instead of two-layers has a cut-away that reveals the blue moon-phase disc. The central sword-shaped white 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
The “Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin” (References below) 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 white gold bracelet, secured by a deployant buckle. 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 Mississippiensis alligator leather strap, both secured by a white gold pin buckle. For more up to date information visit the official Vacheron Constantin website here.
