Patek Philippe Reinvents the Perpetual Calendar Again with Ref. 5320G

Patek Philippe, which famously gave the world its first wristwatch with a perpetual calendar in 1925, reached into its prestigious history with that complication to inspire the new Ref. 5320G, launched at Baselworld 2017. While much post-Basel attention has been justifiably paid to Patek’s technically groundbreaking “Advanced Research” piece, the Aquanaut Travel Time Ref. 5650G, this new perpetual calendar timepiece and its “retro-modern” design should not be overlooked.

Patek Philippe Ref. 5320G - front
Patek Philippe Ref. 5320G – front

Patek Philippe 5320G - Hands-On - Front

The Patek Philippe Ref. 5320G Perpetual Calendar bears the vintage influence of several historical predecessors, including that groundbreaking 1925 model — a unique piece dubbed 97’975, and currently part of the collection at the Patek Philippe Museum in Geneva — as well as several other perpetual calendar watches from the 1940s and 1950s, most of which make only rare appearances nowadays, usually on the auction block. Patek first integrated the perpetual calendar wristwatch into its regular collection in 1941 with the introduction of Ref. 1518, a watch that combined a perpetual calendar with a chronograph. A year later, Ref. 1526, a model without a chronograph function, debuted. Both pieces pioneered the distinctive dial design that still today defines Patek Philippe’s perpetual calendar timepieces: a double aperture directly below 12 o’clock for the day and month displays, and a subdial at 6 o’clock with a moon-phase indicator surrounded by an analog date display. This watch, with its historical-looking cream-colored lacquer dial, adds a few new, subtle elements to this classical layout: a small, round day-night aperture between 7 and 8 o’clock and a round aperture for the leap-year cycle, with Arabic numerals from 1 to 4, between 4 and 5 o’clock. Other familiar elements include the applied gold Arabic numerals and five-minute cabochons with luminous coating, fine-tipped baton hands filled with Super-LumiNova (a callback to Patek’s Ref. 1463 chronograph from the 1950s), a thin, counterbalanced sweep seconds hand; and the graduated seconds scale around the dial’s perimeter.

Patek Philippe Ref. 5320G - angle
The Ref. 5320G Perpetual calendar adds day-night and leap-year indications to the classical dial layout.

The watch’s manufacture movement is Caliber 324 S Q (“S” for seconds, “Q” for quantième perpétuel, or perpetual calendar), based on Patek’s self-winding Caliber 324, which is powered by a large rotor in 21K gold. On the dial side are four disks for the perpetual calendar displays, each rotating at its own rate inside its dial aperture: the day disk, at one revolution per week; month disk, at one revolution per year; leap year disk, at one full cycle over eight years; and the day/night disk, at one rotation per day. The moon-phase disk, behind the analog date at 6 o’clock, requires only one single-day correction every 122 years —  which corresponds to a miniscule daily error of 0.02 per mil. The other side of the movement boasts the array of haute horlogerie finishes and technical refinements for which Patek Philippe has become renowned: bridges with round-chamfered and polished edges; Geneva striping; gold-filled engravings, screws with polished, chamfered slots in bores with polished countersinks; a Gyromax balance with Spiromax balance spring made of high-tech Silinvar; and the aforementioned solid-gold rotor, suspended between ball bearings and decorated with perlage, circular graining, and an engraved Calatrava cross. Like all modern Patek Philippe calibers, this one meets the strict precision and quality criteria of the Patek Philippe seal, meaning, among other things, that its maximum rate deviation ranges between -3 and +2 seconds per day.

Patek Philippe Caliber 24 S Q - front
Patek Philippe Caliber 24 S Q, front (above) and back (below)
Patek Philippe Caliber 24 S Q - back
Patek Philippe 5320G back - Hands-On

The case, made of 18K white-gold, measures 40 mm in diameter and 11.44 mm thick. Like the movement, which is visible through a sapphire caseback, it is crafted entirely in-house, from design to final polishing. Its vintage-influenced design architecture includes so-called “box-form” sapphire crystal over the dial, which enabled the watchmakers to keep the case flanks slender. Visibly extending across the bezel, this crystal is dramatically curved, with parallel inner and outer sides, in order to prevent visual distortion of the dial regardless of the viewing angle. (Of course, such a crystal would’ve been impossible to execute in sapphire back in the 1940s and 1950s, so this watch’s historical predecessors used scratch-resistant plexiglas instead.)

Further demonstrating Patek’s attention to detail, and adherence to this watch’s heritage, even the design of the lugs comes from a 60-year-old predecessor. The Patek Philippe Ref. 2405 introduced the prominent, three-tiered, lug profile revived in the Ref. 5320G, which — in combination with the flat case middle, the beveled, polished bezel, and the overarching, curved crystal — makes for an elegant silhouette on the wrist. Also, a bonus for those who prefer an even more vintage-appropriate style: the watch comes with a solid white-gold caseback that can be swapped with the sapphire exhibition back.

The Patek Philippe Ref. 5320G Perpetual Calendar comes on a lined, hand-stitched, chocolate brown alligator strap with large square scales. It fastens with an 18K white gold foldover clasp in the shape of Patek’s iconic Calatrava cross. Its price in the U.S. will be approximately $82,800.

Patek Philippe Ref. 5320G - profile
The curving three-tiered lugs are inspired by the historical Ref. 2405.
Patek Philippe Ref. 5320G - soldier
Patek Philippe Ref. 5320G – soldier
Patek Philippe 5320G - hands-on 2



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  1. Gerald Quist

    I love this watch! It’s easy to read and you know the build quality is excellent. Great looks.

  2. Arthur Weston

    This perpetual is pretty much a direct copy of the very rare Ref 1591 from 1944, one example of which is in the Patek Museum! Search the museum’s inventory and see for yourself! Most articles have missed the fact that the Ref 1591 is a perpetual calendar with luminous syringe hands, luminous arabic numerals, a sweep seconds hand, day and month in separate apertures below 12 o’clock and moon-phase and date at 6 o’clock. In the flesh the Ref 5320 is truly special and wears smaller than 40mm – in my opinion.

  3. Oliviero Colleoni

    This new entry Patek will defy all quantieme competitor on the market . For me the best Patek quantieme ever made.

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