Patek Philippe Advanced Research 5750P Minute Repeater

Patek Philippe’s Reference 5750P “Advanced Research” minute repeater builds on the venerable automatic caliber R 27, but introduces a revolutionary “fortissimo” amplification system that decouples sound production from case material. Central to this innovation is a tuning-fork–shaped sound lever that picks up gong vibrations and transmits them to an ultra-thin (0.2 mm) sapphire oscillating wafer. Suspended at the movement’s centre, the wafer resonates freely and channels vibrations through a titanium movement ring and narrow openings in the caseband—significantly amplifying the chime regardless of whether the case is platinum or gold.

Despite its technical wizardry, the design remains discreet: the fortissimo module is nearly invisible when observing the repeater, preserving the classic aesthetics of a platinum-cased 40 × 11.1 mm repeater with a vintage-inspired car-wheel motif on the dial. Only 15 pieces were produced, each lacking water resistance but equipped with an internal, dust-protective filter borrowed from smartphone speakers. This avant-garde chiming mechanism effectively harmonises tradition and high-performance acoustic engineering, elevating sound quality and loudness to previously unattainable levels in fine mechanical horology.