• ruby cylinder escapement, temperature compensation curb • gold cuvette with inscription • silvered rayons de soleil guilloché dial, eccentric dials for hours and minutes, Roman and Arabic numerals, fan-form Fahrenheit scale for thermometer • engine-turned case

Sabrier, Jean-Claude, Frédéric Houriet, The Father of Swiss Chronometry (2006) p.170.

The balance rotates for a short time and then stops, movement requires a service. The dial with some scuffs but overall in good condition. Case in good condition. Cuvette inscribed 'Manufactured for T. F Cooper, King William Street, London Bridge, No.1785'.
"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.

Important Notice regarding importation into the United States of Rolex watches
Sotheby's cannot arrange for the delivery of Rolex watches to the United States because U.S. laws restricts the import of Rolex watches. The buyer or a designated agent may collect the property in the country of sale."

Sylvain Mairet was born in 1805 and raised by his uncle, F.I. Favre-Bulle, a watchmaker in his own right. After working in London from 1831 to 1834, for firms such as Hunt & Roskell and Vuillamy, he returned to his native Switzerland and settled in Le Locle. In 1867, he received a gold medal to commemorate his influence on watchmaking in the Canton of Neuchâtel.

His watch cases, among the flattest of the period, have a highly distinctive bow which is hinged directly in the pendant. This extremely elegant bow has since been used by only one horologist: George Daniels, in England. Daniels further improved the system by using the pendant as a winding and time-setting device. At the 1855 Universal Exhibition in Paris, he showed two watches in the Palais de l'Industrie. One had Grande Sonnerie and keyless winding, first using in a watch he finished on April 20, 1850.This device was later adopted for independent seconds, watches and clockwatches which also feature two going trains and two barrels.

Sylvain Mairet was also the inventor of a lever escapement with pointed pallets and lift on the escape wheel teeth. A slot in the bevelled portion of the pallet allows for better oil-retention in the parts subject to friction. This system was adopted so that the locking pallet might be adjusted in order to lessen the drop and equalise the impulses.