Description
Patek Philippe opened the seventh edition of its Watch Art Grand Exhibition in Milan on 1 October 2026 with seven Italian exclusives, and the Ref. 5978P-010 is the one that matters mechanically. It is a platinum chronograph with an instantaneous perpetual calendar — a combination Patek has not built before — limited to 120 pieces for the exhibition.
The headline is the word "instantaneous." Most perpetual calendars creep: the discs drag themselves over to the new date across several minutes either side of midnight. Patek's QI system switches the whole calendar display at once, in roughly 30 milliseconds, using a patented energy-equalisation arrangement so that the jump does not rob the going train. That mechanism has existed since the Ref. 5207, introduced nearly two decades ago, but it has only ever appeared alongside a chiming complication and only in self-winding form. The 5978P-010 is its first outing in a manually wound movement, and its first pairing with Patek's CH 29-535 chronograph.
Design
The case is 950 platinum, 42mm across and 14.24mm thick — substantial, but not unreasonable for a watch carrying both a perpetual calendar and a column-wheel chronograph. Water resistance is a dress-watch 30m, which tells you plainly what this is for.
The dial is a navy blue sunburst fading to a black gradient at the rim, with applied white gold hour markers and a recessed, textured centre that separates the chronograph registers from the outer track. Red chronograph hands cut across it — the one loud gesture on an otherwise formal dial, and the detail that stops the layout reading as a wall of subdials. The calendar is laid out with day, date, month and leap-year indications, a day/night aperture, and a moonphase at six o'clock.
Specifications
- Reference: 5978P-010
- Case material: 950 platinum
- Case diameter: 42mm
- Case thickness: 14.24mm (Patek Philippe official figure; SJX Watches and Revolution print 14.45mm)
- Water resistance: 30m
- Movement: Calibre CH 29-535 PS QI, manually wound
- Frequency: 28,800 vibrations/hour (4Hz)
- Power reserve: 55–65 hours
- Functions: Hours, minutes, small seconds, column-wheel chronograph with instantaneous 30-minute counter, instantaneous perpetual calendar (day, date, month, leap year), day/night indicator, moonphase
- Dial: Navy blue sunburst with black gradient rim, applied white gold markers, recessed textured centre, red chronograph hands
- Limited edition: 120 pieces for Milano 2026
- Price: €318,100 including taxes (Monochrome Watches); SJX Watches reports €315,500 excluding taxes; patek.com lists USD 337,585
What's Exciting
Two things, and the second is the better one. The first is the obvious collector arithmetic: 120 pieces, platinum, an exhibition-only reference, a complication pairing that has no predecessor in the catalogue. That will do what it always does.
The second is that the instantaneous perpetual calendar has finally been decoupled from the minute repeater. For eighteen years the QI module has been a passenger on Patek's most expensive and least obtainable watches, which made it an engineering curiosity rather than a feature anyone could reasonably expect to own. Putting it on a hand-wound chronograph is the first sign that Patek sees it as a calendar architecture rather than a grand-complication garnish. The instantaneous 30-minute chronograph counter, reintroduced with the CH 29-535 in 2009, now has a calendar beside it that behaves the same way — everything on the dial jumps rather than crawls, which is a coherent idea rather than just an accumulation of mechanisms.
The reservation is the obvious one: at 120 pieces and a price Patek will not print, this is a statement about what the movement can do, not a watch entering the collection. Whether the QI module reaches a reference anyone can walk in and buy is the question this watch raises and does not answer.
History
The Watch Art Grand Exhibition is Patek's travelling museum-and-boutique format, staged six times before Milan — Dubai, Munich, London, New York, Singapore and Tokyo — each accompanied by a set of limited editions sold only at the venue. Milano 2026 follows that pattern with seven references, from a 250-piece Aquanaut up to a pair of world-time minute repeaters in runs of five.
The CH 29-535 is the manually wound chronograph calibre Patek introduced in 2009 to replace its bought-in Lemania-based movements, and it brought back the instantaneous jumping minute counter as a signature. The QI perpetual calendar arrived separately in 2006 on the Ref. 5207, and the two have run on parallel tracks ever since. The 5978P-010 is where they meet.
