Display Watch

EW68 front
watch index 26
country British  
piece name (title): Thomas Earnshaw chronometer
set key
plate full
plate finish gilt
date 1800
case style pair
case material silver
serial number 326
maker Thomas Earnshaw was the inventor of the commonly used spring detent escapement and the fused metal compensation balance. His working addresses were 119 High Holborn 1794-1795 and 87 Fenchurch Street 1795-1842.
movement Full plate, keywind, jewelled, going-barrel movement, with cap jewel to the balance cock, (diamond), and cap jewels to the escape. The fusee is fitted with Harrison's maintaining power. The plates are engraved, 'Thos Earnshaw, London INVT ET FECT 326' and 'No. 2367'. Decorative engraving on the balance cock.
escapement Spring detent escapement. Solid polished steel balance wheel with flat hairspring with brass gallows stud, 'sugar tongs' compensation curb.
case A silver open face pair case with polished back covers to both cases, a hallmarked pendant (mark unidentified) placed at the twelve position. Domed brass separate dust cover with steel locking ring. Case not original to watch.
case marks Both outer and inner cases are hallmarked Sterling silver, anchor for Birmingham, Olde English H for 1831, maker CR for Charles Reed of Coventry (registered 1829).
dial and hands White enamelled dial with Roman hour chapter, closed minute ring to the outside, in fair condition, signed 'Thos Earnshaw, London' above and 'INVT ET FECIT 326' below the arbour.

The gold Breguet-style hour and minute hands are unoriginal.
notes The two serial numbers engraved on the movement are standard for Earnshaw; the lower number is the sequential number for a chronometer, the higher number the total sequence in Earnshaw's total manufacture. The complete balance wheel assembly is typical of Earnshaw&apso;s earlier work.
valuation This is not a full chronometer in that it has a solid steel balance wheel rather than a chronometer balance. It is an early example by a famous and collectible maker, and has the interesting feature of Earnshaw's sugar tongs compensation curb. The value is reduced by the unoriginal case and hands, but the case is early enough to be of interest.

The condition of the movement is very good, the dial fair and the case poor.

No recorded sales of similar watches have been found, and this valuation has been based on the rarity, the quality and collectability of the maker, and prices achieved for chronometers by other reputed makers of a similar or later date.
copyright © 2017 Graham Morse and Martin Rosen
EW68 front
EW68 front side
EW68 bacl
EW68 inside case back
EW68 cases open
EW68 works
EW68 works detail
EW68 two cases
EW68 fusee
EW68 fob
EW68 dial and maker
EW68 cases open
EW68 open case
EW68 dial detail
EW68 dial detail
EW68 marks in case
EW68 case marks
EW68 balance wheel detail
EW68 balance
EW68 balance detail
hallmark and case
filled holes
filled holes
filled hole detail
filled hole detail 2