Lot No. 581* (89th Auction)
Thomas Earnshaw "Junior", London, Movement No. 1609, 55 mm, 152 g, circa 1840/1937

A very fine pocket chronometer with spring detent escapement in a later custom made case
Case: 18k gold, polished, engraved cartouche, gold dome, case maker's punch mark "JTW", London hallmark 1937. Dial: enamel, radial Roman hours, auxiliary seconds, gold spade hands. Movm.: full plate movement, keywind, frosted, gilt, signed, chain/fusee with Harrison's maintaining power device, moulded movement pillars, screw compensation balance, freesprung blued helical balance spring with both sides passing terminal curves, florally engraved balance cock, chatoned diamond endstone on balance.

Thomas Earnshaw "Junior"
Earnshaw was the father of the modern mechanical chronometer. If not its inventor, he combined the best features of the system, invented his own spring detent escapement which became the standard in the vast majority of pocket and marine chronometers since. Earnshaw system was patented in 1783. Earnshaw did not have money to pay for the patent fees. His master, Thomas Wright, paid the fees in exchange for royalties.
Estimate  3,800 - 4,500 €

Price Realised  5,500 €
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