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Important Modern & Vintage Timepieces

Geneva, Jun 28, 2020

LOT 320

JAMES HORNBY POCKET CHRONOMETER; "IMPROVED" GUYE DETENT ESCAPEMENT; 18K YELLOW GOLD

Very fine and rare18K yellow gold, half hunting-case, key-winding, round-shaped, pocket chronometer, with subsidiary seconds at 6 and “improved” spring detent escapement. Cover and case-back guilloché (engine-turned). White enamel dial with radial Roman numerals; yellow gold double “Spade” hands.

Brand James Hornby

Model Improved Patent Chronometer

Year Circa 1859-1860

Movement No. 39113 (stamped "Guye's Patent / Escapment"

Case No. 14.0 (by "H F", Chester), with Chester letter-date for 1859-1860

Caliber 18''', ¾ plate, gilded brass, fusee and chain, gold screwed-chatons (setting), "improved" Guye detent escapement, cut bimetallic compensated balance with gold poising screws and free-sprung cylindrical hairspring with terminal curves, diamond end-stone.

Dimensions 49.8 mm.

Signature Dial, case and movement

CHF 800 - 1,400

HKD 6,400 - 11,200 / USD 800 - 1,400

Sold: CHF 2,750


Grading System
Grade: AAA

Excellent

Case: 3

Good

Movement: 3*

Good

Overhaul recommended, at buyer's expense

Dial: 3-70-01

Good

ENAMEL AND VARIOUS TYPES OF DECORATION Hairline

HANDS Original