Audemars Piguet recently announced a 20-piece limited edition of the Royal Oak Perpetual Calendar in platinum, based on the same dimensions, dial, and movement as the ceramic version that came out in 2017.

The Royal Oak Platinum Perpetual Calendar comes in a 41 mm x 9.5 mm 950 platinum case and bracelet. Like the other versions, there’s an exhibition caseback offering a view of the gorgeously executed movement. The watch has a screw-locked “AP” emblazoned crown, and water-resistance is 20 meters.

The combination of a black dial with “Grande Tapisserie” pattern, two-tone black and rhodium-toned counters, white gold applied hour-markers, and Royal Oak hands with luminescent coating, black weekday flange, looks sublime. Not to mention the moon phase indicator, which was created using a laser and that’s laid on aventurine, further enhancing the overall aesthetic of the dial.

Functionally the watch has a perpetual calendar with week indication, day, date, astronomical moon, month, leap year – along with hours and minutes. The moon phase astronomical indicator requires correction every 122 years and 108 days.

Driving all the functions is automatic caliber 5134 which beats at 2.75Hz and measures 29 x 4.31 mm (based on caliber 2120) and enlarged to fit the wider 41 mm case size (up from 39 mm). The extra-thin movement features a suspended barrel, a free-sprung balance wheel, 374 components, 38 jewels, and a 40-hour power reserve. All components have been manually finished and the 22K pink gold skeletonized oscillating weight can be custom decorated upon request. The oscillating weight is guided by a peripheral ring rolling on four ruby runners, which reduces friction and wear to the minimum possible

The Royal Oak Perpetual Calendar (Ref. 26597PT.OO.1220PT.01) retails for $166,800.