An excellent watch made by one of the London?s greatest watch-makers in collaboration with one of the best casemakers. James Richards was one of the most esteemed casemakers in London at the time, listed from 1762 to 1822. Josiah Emery (c. 1725-1797). A Swiss watchmaker, born in Gene-va, who settled in England and had a shop at 33 Cockspur Street, Charing Cross, London. He made very fine cylin-der watches, but became famous as the first watchmaker in the world, after Tho-mas Mudge, to produce a watch with a lever escapement. He made about thirty-six lever watches between 1782 and 1795. Three of Emery?s le-ver watches were imported into France and served as a model for Robert Robin for a series of precision watches that he produced at the end of the eighteenth century. One of these watches was shown to Louis Berthoud, who used the escapement several times, attempted to improve it, but finally abandoned it in favor of the pivoted detent escapement. In 1782, Emery patented his "double S" balance, a fact which he advertised widely. Most of Emery?s "double S" balances are found in his lever watches, which he started making in 1782, the year of the patent. He produced less than 40 of them, of which fewer than twelve are known to have survived. Emery submitted four chronometers to the "Office of Longitude" between 1792 and 1796, but obtained no success with them. He studied and corrected the error of the escapement of the chronometer made by Genevan clockmakers Demole & Magnin. His workmanship is always superlative, equal to the best of his contemporaries, including Arnold. Louis Berthoud said of Emery?s work that it was particu-larly good in its essential points, and not "showy". In 1781, his excellence was recognized by his peers, who elected him an Hon-orary Freeman of the Clockmaker?s Company, a distinction rarely given. He was succeeded by Recordon and Dupont in 1796.