PATEK PHILIPPE | A FINE AND RARE OPEN FACED TOURBILLON WATCH MADE IN 1922

Dial: enamelCaliber: 19'" ligne movement, 18 jewelsMovement number: 197734Case: 18k yellow gold, sapphire display cuvette, concealed hinged case backCase number: 412253Size: diameter 53 mmSigned: case, dial and movementAccessories: Patek Philippe Extract from the Archives confirming the year of manufacture in 1922 and sale on May 4, 1927 with enamel dial and Roman numerals, with prizes awarded during the Chronometer pocket watches contest in 1924, 1925 and 1926

CASE Approximately 139.5 grams. Case in overall very good condition with light wear and surface scuffs. Gold mark and PPC mark to the bow rubbed, but visible. Some light surface scuffs throughout. DIAL Dial is very attractive overall. A faint hairline between 12 and 1. Some light dust. MOVEMENT The movement is running at time of cataloging, however it was not tested for the accuracy of time or duration of the power reserve and may need service at the buyer's discretion. Please note that Sotheby's does not guarantee the future working of the movement.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. All dimensions in catalogue descriptions are approximate. Condition reports may not specify mechanical replacements or imperfections to the movement, case, dial, pendulum, separate base(s) or dome. Watches in water-resistant cases have been opened to examine movements but no warranties are made that the watches are currently water-resistant. Please note that we do not guarantee the authenticity of any individual component parts, such as wheels, hands, crowns, crystals, screws, bracelets and leather bands, since subsequent repairs and restoration work may have resulted in the replacement of original parts. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue. In particular, please note it is the purchaser's responsibility to comply with any applicable import and export matters, particularly in relation to lots incorporating materials from endangered species.NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

**Please be advised that bands made of materials derived from endangered or otherwise protected species (i.e. alligator and crocodile) are not sold with the watches and are for display purposes only. We reserve the right to remove these bands prior to shipping."

It is extraordinary to note that the present watch underwent the rigorous tests of l'Observatoire de Geneve, with prizes awarded during the Chronometers Pocket Watches contest in 1924, 1925, and 1926. Indeed, the present lot is recorded in Meis, R., Das Tourbillon, for winning the prestigious first place prize in 1924. The Geneva Observatory along side the Neuchatel and Kew Observatories were the most prominent European institutions assessing and rating timepiece movements for accuracy. Testing at the Geneva Observatory initially lasted 40 days and required the watch to be tested in different positions and at varying temperatures to check its ability to maintain outstanding accuracy. Accuracy in timekeeping has been critical to advances in Science and, in 1873, the Observatory in Geneva held its first annual Chronometer competition. Patek Philippe won the much coveted 1st prize for the first time in 1884.

J. Golay-Audemars, one of the best régleurs at Patek Philippe at the time, oversaw the regulation of this movement during the 1924 contest. This famous régleur was prominently featured amongst prize winning movements at the Geneva Observatory, documented from 1917 to as late as 1934.

THE TOURBILLON:
Originally invented to improve the accuracy of pocket watches, the tourbillon is considered one of the most challenging of all horological complications. Invented in 1801 by Abraham-Louis Breguet, a tourbillon counters the effects of gravity by mounting the escapement and balance wheel in a rotating cage to negate the effect of gravity when the timepiece, and thus the escapement, is in constant motion. At the time of the tourbillon's invention, gravity and movement were known to have an adverse effect on the accuracy of timepieces, horologists knew that pocket watches suffered from the effects of gravity since they were usually carried in the same pocketed position, continuously moved during the day and then held in a different position while being read, all of which affected their accuracy. In a tourbillon, the entire escapement assembly rotates, including the balance wheel, the escape wheel, the hairspring, and the pallet fork, to average out the effect of gravity in the different positions and thereby improve the watch's timekeeping.

The present lot with movement number 197734 is listed in Meis, R., Das Tourbillon, Verlag Laterna Magica, 1986, p.352.