139 John Roger Arnold, , Inv.t et Fecit, Movement No. 2045, Case No. 2045, 58 mm, 187 g, circa 1808

An English pocket chronometer with spring detent Case: silver, case maker’s punch mark “FT” (Frederick Thoms), London hallmark for 1891. Dial: enamel. Movm.: full plate movement, Arnold’s spring detent escapement, Z balance with 2 weights and 2 screws, blued helical , very finely engraved balance cock.

Chronometers made by John Arnold and his son John Roger Arnold were valued very highly and usually in use for decades. The at hand is an excellent example of this; the movement was fitted into a new, tailor-made case made by Frederick Thoms, who was most likely the most famous casemaker in his time. On the same occasion, the movement was updated with a new dial and a new set of hands.

John Roger Arnold Inv.t et Fect — ，倫敦， 英國懷錶時計，附發條衝擊式 天文台擒縱 52200 C: 2, 22 D: 2, 22, 32, 33 M: 2, 41, 51 6.500 - 8.500 EUR 7.700 - 10.000 USD 58.500 - 76.500 HKD

140 John Arnold, London, Invt. et Fecit, Movement No. 43/344, 54 mm, 119 g, circa 1783 A pocket chronometer - “OF THE SECOND QUALITY” - of historical interest with spring detent escapement and original mahogany box Case: silver, dedication engraving, case maker’s punch mark “WW”. Dial: enamel. Movm.: full plate movement, Arnold’s spring detent escapement, OZ balance, helical gold balance spring, very finely engraved pierced balance cock. The engraving on the silver case next to the compulsory hallmark and the date stamp of 1783 states that “This chronometer travelled around the world with captain and was presented to the honourable Mr. Alexander Lean, secretary of the Hudson’s Bay Company, by the company in 1816.” Cook’s third and last voyage, however, lasted from 1776 to 1779 and the case of this chronometer was clearly not made until seven years later; taking these facts into consideration in connection with several technical details of the chronometer – such as the spring detent escapement, the OZ balance and the cylindrical gold balance spring, which Arnold only started using around 1779 – it is probable that the case was created at a later date; it is very unlikely that the case would have been engraved with a dedication that was deliberately untruthful. It is certain that the case and the dial were made around 1783. John Arnold Invt. et Fecit — - “OF THE 倫敦 生動歷史背景的懷錶時計 SECOND QUALITY” 次優品質，附發條衝擊式天文台擒縱及桃花心木原盒 52199 C: 2 D: 2, 4, 33 M: 2, 41, 51 14.000 - 20.000 EUR 16.400 - 23.400 USD 126.000 - 180.000 HKD