Audemars Piguet Royal Oak Tourbillon Chronograph Openworked Ceramic — Skeleton Dial | Ref. 26343CE.OO.1247CE.01

There are watches that tell the time, and there are mechanical sculptures that happen to carry a tourbillon and a chronograph. Ref. 26343CE.OO.1247CE.01 belongs unambiguously to the latter category: a 44mm forged black ceramic case — chosen for its diamond-like hardness and featherweight presence — housing one of the most technically demanding openworked movements Audemars Piguet has produced outside its Les Cabinotiers atelier. The entirely skeletonised dial removes every visual barrier between the wearer and the mechanism, inviting the eye to follow the hand-winding architecture from tourbillon cage to column wheel to the bevelled bridges that reflect light against the matte black background.

The manual-winding calibre at the heart of this reference combines a flying tourbillon — regulating the escapement against the distortions of gravity — with an integrated column-wheel chronograph, a pairing that demands extraordinary spatial engineering within a dial that must simultaneously remain legible. The ceramic octagonal bezel echoes Genta's original 1972 geometry while adding a modern hardness both literal and aesthetic; it cannot be scratched by anything short of a diamond, and it will never fade or tarnish across decades of wear. A transparent caseback reveals the movement architecture in full, completing a 360-degree showcase of craft.

Produced between 2017 and 2022, this reference is now out of regular production, compressing its collectability. The all-ceramic integrated bracelet — machined to the same micron tolerances as the case — and AP folding clasp deliver security and comfort in equal measure. For serious complications collectors, few references in the modern AP catalogue combine material innovation, artistic openworking and genuine mechanical complexity at this level.