Patek Philippe caliber 300 GS AL 36-750 QIS FUS IRM

Patek's masterpiece movement that took an alleged 8 years of development. A total of 1.366 parts is working in perfect harmony to keep their most complicated wristwatch yet operating. It's functions include a Grande Sonnerie, Petite Sonnerie and minute repeater, a strikework mode display for the sonnerie (Silence/ Grande Sonnerie/Petite Sonnerie), an alarm with time strike, a never-before-seen date repeater, a power-reserve indicator for the movement as well as for the strikework, a strikework isolator indicator, a second time zone plus a day/night indicator for it, an instantaneous jumping perpetual calendar with display of day and month, date display (both front and back), leap year cycle and a four-digit year display, a moon phase display, a 24-hour and minute subdial, and a crown position indicator (winding [R], alarm setting [A], timesetting [H]). They are displayed through dials on both front as well as the back of the movement.