At the heart of this reference lies the self-winding Caliber R 27 PS QR LU, a movement whose every component is visible through the skeletonized, transparent dial. The retrograde perpetual calendar tracks the day, date, month, and year with mechanical precision, while the minute repeater chimes the hours and minutes on demand. Black hands and golden powdered dot hour markers provide orientation against the open architecture of the movement, and a scratch-resistant sapphire crystal protects the view from above.
The round 43mm rose gold case is dressed with a bezel set with 80 baguette-cut diamonds, merging high-jewelry craftsmanship with grand complication watchmaking. A fold clasp secures the leather strap, completing an ensemble that carries the Swiss Made designation and meets the standards of the Geneva Seal. The watch offers no water resistance, a considered trade-off in service of the acoustic and mechanical complexity within.
This example is offered in new condition and comes complete with its original box and papers. Reference 5304/301-001 sits within Patek Philippe's Grand Complications collection, a lineage dedicated to the most demanding feats of mechanical ingenuity, and is sized and styled for the male wrist seeking a significant horological statement.
