Case material: Rose gold; Charge: Manual; Conditions: Never worn Presentation condition : With boxes and all papers; Model: Master Calendar Price on request Gmtbroker Reference: Q1612420 the only perpetual calendar with an 8-day power reserve. two barrels, 28,800 vibrations per hour, variable inertia balance. all the functions of the perpetual calendar (mechanically programmed until 2100) are activated by a single corrector. legibility and balanced dial display. indication of the year in full. also known as: jlc q1612420, 1612420, jaegerlecoultre q1612420