The Patek Philippe Grand Complications reference 5304/301R-001 is a 43mm haute horlogerie timepiece that combines a minute repeater and a retrograde perpetual calendar within a multi-metal case of 18k rose gold and white gold. The case features a thickness of 13.3mm and is distinguished by white gold inserts on the flanks and lugs engraved with a delicate leaf pattern. This model is further elevated by a gem-set bezel and lugs featuring 58 baguette-cut diamonds, totaling approximately 5.25 carats. It is powered by the self-winding caliber R 27 PS QR LU, which utilizes a 22k gold off-center mini-rotor and offers a power reserve between 38 and 48 hours. The watch is worn on a shiny black alligator leather strap with a fold-over clasp set with an additional 22 baguette-cut diamonds.
The watch’s complications are centered around its innovative skeletonized sapphire dial, which uses transparent disks to display the day, month, and leap year apertures. A central retrograde hand with a red crescent tip indicates the date along an outer arc. At the 6 o’clock position, the small seconds sub-dial integrates a moon-phase display. The minute repeater is activated by a sliding lever on the left side of the case, chiming the hours, quarters, and minutes on two classic gongs. This movement, composed of 517 parts, is visible through both the openworked dial and the sapphire crystal case back, which highlights the meticulous finishing required for a Grand Complication. Notably, the case is designed to be humidity- and dust-protected only and is not water-resistant.
General reviews of the 5304/301R-001 emphasize its role as a masterclass in both mechanical transparency and decorative arts. Critics and collectors frequently praise the “miracle of transparency” achieved by the sapphire disk calendar system, which allows the wearer to view the underlying mechanical interactions without sacrificing legibility. The addition of high-jewelry elements in this reinterpretation is noted for providing a high-impact, luxurious frame for the technical complexity of the R 27 caliber. While its 43mm diameter is large for traditional Patek Philippe standards, it is often cited as necessary to house and showcase the density of its complications. Some observations highlight the watch as a bold departure from more conservative aesthetics, serving as a signature piece for collectors who value visibility and artistic flair in high-end watchmaking.