Made in 1880, this Patek Philippe Perpetual Calendar Chronograph is believed to be a piece unique. The watch combines a perpetual calendar with moon phases and single pusher chronograph. It is highly unusual to find this combination of complications in a Patek Philippe pocket watch without the additional function of minute repetition. Of particular note is the exceptional finishing of the movement and the fact that this watch was completed to chronometer standards. Complication, chronometer rated watches by Patek Philippe are very rarely found on the market and the Extract from the Archives confirms that this watch was awarded an honourable mention in the 1883 chronometer contest organized by the Société des Arts de Genève in 1883. During this period, the Geneva Observatory was owned, financed and managed by the Société des Arts de Genève. The watch was adjusted for the contest by the regulator, Beaufrère, and the watch achieved a score of 167.1 points. To be offered in ‘Important ...