| A rare 19th Century English
chronometer with solid sapphire impulse jewel in a silver full hunter case.
Gilt half plate keywind movement with fusee and chain. Harrison's
maintaining power. Plain cock with diamond endstone. Compensation balance
employing quarter timing nuts, freesprung helical blue steel hairspring.
Earnshaw type spring detent escapement, the impulse jewel made from a
solid sapphire roller. Signed and numbered white enamel dial with subsidiaries
for power reserve and seconds, Roman numerals, blue steel hands. Substantial
engine turned silver with ribbed middle. Keywound and set through the
silver cuvette, maker's mark "TH". |
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