Rare George III silver pair cased pocket chronometer by Fren...

Hammer

£1,900

Rare George III silver pair cased pocket chronometer by French, Royal Exchange, London, London 1810, signed fusee movement, no. 226, with spring detent escapement, engraved balance cock with mask, diamond endstone, free sprung helical hairspring, 'sugar-tong' compensation, flat steel three arm balance and cylindrical pillars, signed and numbered dial with Roman numerals, minute track and subsidiary seconds, gilt disc hands, within plain matching cases, case maker 'DW' (Daniel Willmott), 47mm; key
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** The 'sugar-tong compensation', an invention of Thomas Earnshaw, is an arrangement with two bimetallic arms with one pin on each end. Instead of sliding along the balance-spring the gap between the two pins widened in cold weather and closed in hot, which has the same effect. Owing to its appearance and action, Earnshaw’s curb is usually known as a 'sugar-tong compensation'. It is thought that these watches were made to withstand robust use rather than watches with the heavier bimetallic balances that could easily break the balance pivots if subjected to shock. This invention must date from circa 1795.

More Information

Movement - currently functioning.
Dial - the outer edge of the dial is chipped, hairline to the outer edge at the eight position.
Glass - light surface marks.
Hands - good.
Case - inner case with general light surface marks, rubbing to the stem and bow, outer case with tarnishing and small indentation to the case back, small gap to the outer case when closed.
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Condition reports are provided for general guidance only. Please view images and further information can be obtained upon request. Gardiner Houlgate do not guarantee the working order or time accuracy of any lots. Due to the opening of the wristwatch case backs, it is recommended watches are re-sealed by professional technicians to ensure any stated water resistance is retained