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Auktionen Dr. Crott 91st Auction

471*470 Du Bois & Fils, Le Locle, Case No. 930, 57 mm, 120 g, circa 1830  A gentleman’s almost as new pocket watch with very rare Debaufré escapement, jumping centre seconds, regulator dial and mock pendulum Case: 18k gold, polished. Dial: enamel, eccentric hour indication with Arabic numerals, centre seconds, aperture for mock pendulum, gold Breguet hands. Movm.: full plate movement, frosted, gilt, Debaufré escapement, large five-arm ring balance. Du Bois & Fils In 1785 Philippe Du Bois and his sons founded the “Du Bois & Fils 1785” watch company at the family seat in Le Locle. Du Bois had already established extensive business connections all over Europe and America as a cloth merchant, which made things much easier for the start-up watch company. During the 19th century Du Bois & Fils opened branches in Germany, the Netherlands, Spain and the United States and business boomed. Due to its proximity to the trade fairs the German Frankfurt branch was particularly important. Source:, as of 03/12/2011 The Debaufré Escapement Invented by P. Debaufré in 1704, this escapement is distinguished by having two escape wheels which are mounted on the same arbour. The escape wheels are staggered. They interact with a semi-circular, wedge- shaped pallet on the balance staff which has chamfered edges. The wheels, which alternately rest on the flat underside or escape past it, impart the impulse to the balance. Du Bois & Fils, Le Locle — 保存如新的男仕懷錶,附極罕見的 Debaufré擒縱,跳躍式中心秒針,校準錶盤及仿鐘擺 40724  C: 2 D: 2 M: 2, 41  14.000 - 18.000 EUR 15.500 - 19.800 USD 126.000 - 162.000 HKD Pierre Jaquet-Droz, Movement No. 42059, Case No. 3185, 54 mm, 122 g, circa 1790  A gentleman’s quarter repeating pocket watch Case: 18k rose gold, polished, reeded band, pusher for repetition via pendant. Dial: enamel, Arabic numerals, signed, blued Breguet hands. Movm.: full plate movement, keywind, applied floral decorations, signed, gilt, chain/fusee, 2 hammers / 2 gongs, verge escapement, three-arm brass balance, steel balance bridge. Pierre Jaquet-Droz (1721 - 1790) Pierre Jaquet-Droz was a Swiss-born watchmaker of the late eighteenth century. He lived in Paris, London, and Geneva, where he designed and built animated dolls, or automata, to help his firm sell watches and mechanical birds. Constructed between 1768 and 1774 by Pierre Jaquet-Droz, his son Henri-Louis (1752-1791), and Jean-Frédéric Leschot (1746-1824) were The Writer (made of 6000 pieces), The Musician (2500 pieces), and The Draughtsman (2000 pieces). His astonishing mechanisms fascinated the kings and emperors of Europe, China, India, and Japan. Some consider these devices to be the oldest examples of the computer. The Writer has an input device to set tabs that form a programmable memory, 40 cams that represent the read-only programme, and a quill pen for output. The work of Pierre Jaquet-Droz predates that of Charles Babbage by decades. The automata of Jaquet-Droz are also considered to be some of the finest examples of human mechanical problem solving. Three particularly complex and still functional dolls, now known as the Jaquet-Droz automata, are housed at the art and history museum in Neuchâtel, Switzerland. Source:, as of 09/09/2014. Pierre Jaquet-Droz — 男仕二問懷錶 40144  C: 2, 7, 10 D: 3, 17, 32 M: 2, 41, 51  3.000 - 4.000 EUR 3.400 - 4.400 USD 27.000 - 36.000 HKD