Both faces of this remarkable timepiece carry ebony black opaline dials mounted on 18K solid gold plates. The time side features gold applied Breguet numerals over a hand-guilloché hobnail pattern, while the calendar side presents the same deep ebony tone in a cleaner arrangement. The case measures 49.4mm in diameter and 16.32mm in height, with 387 baguette-cut diamonds (30.16 cts) adorning the bezels and case, and humidity- and dust-protection noted in lieu of water resistance.
The movement delivers an extraordinary roster of functions: grande and petite sonnerie, a minute repeater with classic gongs, a strikework mode display, an alarm with time strike and on/off indication, and a date repeater. A strikework isolator, power-reserve indications for both movement and strikework, and crown position display (R A H) round out the mechanical architecture. The instantaneous perpetual calendar tracks day, date on both dials, month, and leap-year cycle by hands, with a four-digit year aperture, moon phases, a second time zone with day/night indication, and a 24-hour and minutes subdial.
The watch is presented on a shiny black alligator leather strap with square scales and hand-stitching, secured by a diamond-set fold-over clasp set with an additional 22 baguette-cut diamonds (1.19 ct). Reference 6300-400G-001 stands as a testament to the full breadth of Patek Philippe's Grand Complications tradition.
