Jump The firm was founded in 1854 by the brothers Richard Thomas and Joseph Jump who had both been apprenticed to and worked for B.L. Vulliamy. Richard Thomas was the inventor of the clockmaker's sector, a proportional gauge chiefly used for wheels and pinions. An ornament of Bond Street, through several generations, the firm made a wide variety of clocks, many of them in the style of Breguet. From at least 1883, they made a number of ?humpback? bracket clocks similar to those of Breguet, and were also responsible for the overhauling and recasing of the astronomical clock by Samuel Watson in the Royal collections. Silver ?humpback? carriage clocks were introduced by Breguet circa 1813. During Breguet?s lifetime only a few were made; they are among the best ? and the most expensive - he ever produced. The humpback model has been very popular, its shape being used not only by the house of Breguet but by others such as Cole and Jump in England, for instance, for two hundred years after its creation. Even fewer carriage clocks of this type were made in the early 20th century, at the request of important clients. The most complicated was the one completed for Ettore Bugatti in 1931; it was a replica of the most elaborate carriage clock made in the early 19th century. In 1909 the Breguet firm sold one to Empress Maria Fedorovna (see Antiquorum, Oct 20, 2002, lot No. 150), and another one to Grand Duc Alexis of Russia for 3,000 Francs (Antiquorum, Dec 5, 2002, lot 351). Toward the end of the 19th century in England, James Jump made a few silver carriage clocks in the ?humpback? style. Today they are among the most sought-after by collectors, along with those made by Breguet. James Fergusson Cole also made a few. The clocks made by both Jump and Cole are very rare and on a par with those produced by Breguet.