F.P. Journe Releases Octa Perpetual Calendar
Independent watchmaker Francois-Paul Journe has added a ninth model to his eponymous brand’s Octa collection, called the F.P. Journe Quanti��me Perp��tuel, a perpetual calendar timepiece with an instantaneous jump function. The watch, which will be limited to 900 pieces, made its debut in Geneva during the SIHH and GTE watch fairs.A perpetual calendar (“quanti��me perp��tuel” in French) displays the exact date �� along with the day, month, and often the moon-phase �� by automatically taking into account the variable length of the months and leap-year cycle. Creating such a calendar is one of watchmaking’s most difficult feats, since its movement must have a mechanical memory of 1,461 days, or four years. The mechanism is usually based on a differential gear system from the hour wheel and includes several hundred components, cogs, gears, levers and rockers. A small toothed planet wheel connected to the month's mechanism makes a complete rotation in four years. During

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