John Roger Arnold, London, Inv.t et Fecit 英國，機蕊號 2167，59 mm，215 g，約 1818
John Roger Arnold, London, Inv.t et Fecit, Movement No. 2167, 59 mm, 215 g, circa 1818
A heavy and rare pocket chronometer with spring detent escapement according to John Arnold
Case: silver, polished, tiered, case maker punch mark "TH" (Thomas Hardy). Dial: enamel, radial Roman hours, auxiliary seconds, numbered, signed, gold spade hands. Movm.: full plate movement, frosted, gilt, chain/fusee, round pillars, keywind, signed, spring detent escapement according to John Arnold, chronometer balance with 4 adjusting screw nuts and 6 screws, blued helical freesprung balance spring with both sides passing, chatoned diamond endstone on balance.
John Roger Arnold (1769-1843)
John Roger Arnold was the son of renowned British horologist John Arnold. He began his apprenticeship with A.-L. Breguet in Paris in 1792. The younger Arnold became a member of the Clockmaker's Company in 1796 and was a Master in 1817. He took up a partnership with E.J. Dent in 1830 and the two craftsmen experimented heavily during their work together; in particular they concentrated on the effects of magnetism on chronometers. Dent left Arnold in 1840, whereupon Arnold continued working on his own but died only three years later. Charles Frodsham bought the business after Arnold’s death in February 1843 and it flourished until 1858 under the name Arnold and Frodsham.
机蕊 非常好, 走動正常
机蕊 非常好, 走動正常