
Lot 22
Tissot. A fine late 19th century 18ct gold keyless wind open face chronometer pocket watch with original box and chronometer certificate Circa 1896
10 December 2014, 14:00 GMT
London, New Bond StreetSold for £5,000 inc. premium
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Tissot. A fine late 19th century 18ct gold keyless wind open face chronometer pocket watch with original box and chronometer certificate
Circa 1896
Jewelled lever movement with bascule escapement, bi-metallic balance wheel, Breguet over coil spring and Philipps curve, screw down chatons, white enamel dial with painted black Roman numerals and outer red painted Arabic 24 hour indication, small subsidiary seconds at 6, polished round hinged case with signed and engraved case, engine turned case back with monogram, together with fitted wooden box and numbered observatory certificate dated 1896 , case and dial signed
54mm.
Jewelled lever movement with bascule escapement, bi-metallic balance wheel, Breguet over coil spring and Philipps curve, screw down chatons, white enamel dial with painted black Roman numerals and outer red painted Arabic 24 hour indication, small subsidiary seconds at 6, polished round hinged case with signed and engraved case, engine turned case back with monogram, together with fitted wooden box and numbered observatory certificate dated 1896 , case and dial signed
54mm.
Footnotes
The certificate with this watch notes both a 'Bascule escapement' and 'Philipps sprial'.
The bascule escapement is essentially a detent escapement in which the detent is pivoted, and the tension being supplied by a small hairspring.
The French engineer, M. Phillips, studied the mathmatical properties of the Breguet terminal curve extensively in order to find the exact forms suitable for watch mechanisms. George Walker and W. Barber later introduced a practical way to include this in watches.
See The Watch and Clockmaker's handbook, Britten