I recently acquired this Richard Clarke & Sons pocket chronometer with an Earnshaw spring detent escapement in a heavily chased 18k gold case by Thomas Hardy circa 1823. The watch is quite heavy at 153 grams.
The movement and case are in almost mint condition with extremely crisp chasing and engine turning.
I'm wondering what the cross like mark is below the TH mark?
Also do you think Thomas Earnshaw had any hand in this movement?
I found a Thomas Earnshaw marked pocket chronometer repeater with the same rope engraving on the edge of the plate from around the same period. I'm wondering if this was simply a fashion at the time or was it a particular stylistic detail that Earnshaw employed?
catalog.antiquorum.swiss
I'd also be grateful if anyone had any more information on Richard Clarke & Sons. From my cursory Google search, it appears he was a high end jeweler who worked in the Georgian/Regency era who also sold fancy pistols and the like:
www.britishmuseum.org
www.garthvincent.com
Bonham's sold an almost identical watch but with what seems to be an amplitude limiter several years back:
www.bonhams.com
The movement and case are in almost mint condition with extremely crisp chasing and engine turning.
I'm wondering what the cross like mark is below the TH mark?
Also do you think Thomas Earnshaw had any hand in this movement?
I found a Thomas Earnshaw marked pocket chronometer repeater with the same rope engraving on the edge of the plate from around the same period. I'm wondering if this was simply a fashion at the time or was it a particular stylistic detail that Earnshaw employed?
THOMAS EARNSHAW QUARTER-REPEATING POCKET CHRONOMETER WITH Z BALANCE GOLD Thomas Earnshaw, Invt. Et Fecit, London, No. 3973. The cases with London hallmarks for 1819-20. Very fine and rare, 18k gold, pair-cased pocket Chronometer with "Z" balance. | Important Modern & Vintage Timepieces | Geneva, May 15, 2016
Antiquorum is the world's premiere auction house of modern and vintage timepieces. Buy or sell watches like Patek Philippe, Rolex and Audemars Piguet. Expert appraisals, valuations and more. Browse our auction catalog.

I'd also be grateful if anyone had any more information on Richard Clarke & Sons. From my cursory Google search, it appears he was a high end jeweler who worked in the Georgian/Regency era who also sold fancy pistols and the like:
Collections Online | British Museum
A Good Four-Barrelled Box-Lock Pistol by Clarke of London.
A Good Four-Barrelled Box-Lock Pistol by Clarke of London.
Bonham's sold an almost identical watch but with what seems to be an amplitude limiter several years back:

Bonhams : Richard Clarke & Sons, Cheapside, London. A rare 18K gold key wind open face chronometer pocket watch Movement No.5151, London Hallmark for 1820
Movement No.5151, London Hallmark for 1820 Gilt full plate fusee movement, engraved balance cock with diamond end stone, Earnshaw type spring detent escapement, cut and compensated bi-metallic balance with polished weights, blued steel helical spring, textured champagne dial with highly polished...
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