The Patek Philippe Grandmaster Chime reference 6300/403G-001 is a masterpiece of Haute Horlogerie and Haute Joaillerie, representing the manufacturer’s most complicated wristwatch. This exceptional timepiece features a 49.4mm white gold reversible case with a patented rotation mechanism that allows the wearer to display either of the two ebony black opaline dials. The watch is lavishly decorated with 118 baguette-cut emeralds and 291 baguette-cut diamonds using an invisible setting technique on the caseband, lugs, and swivel links. It is paired with a shiny black alligator leather strap featuring emerald-green hand-stitching and a fold-over clasp also set with emeralds.
The watch is powered by the manually wound caliber 300 GS AL 36-750 QIS FUS IRM, which comprises 1,366 individual parts and 108 jewels. It boasts 20 complications, including five acoustic functions: a grande and petite sonnerie, a minute repeater with three classic gongs, a patented alarm sounding the programmed time, and a patented date repeater. Additional complications include an instantaneous perpetual calendar with a four-digit year display, a second time zone with day/night indication, moon phases, and separate power-reserve indicators for both the movement and the strikework.
General reviews emphasize that this reference is one of the most exclusive and technically ambitious timepieces ever produced, showcasing Patek Philippe’s supreme mastery of complex mechanical engineering and gem-setting. It is frequently noted for its monumental case size and the sheer density of its horological features. While its high complexity makes it a landmark achievement, reviewers often highlight that the case is humidity- and dust-protected only, meaning it is not water-resistant and requires meticulous care.