Fine large pocket chronometer Deck Watch, with rare 'duo-in-uno' balance-spring.
Silver 'crystal' case hallmarked London 1869, casemaker GJO (George John Oliphant, London). Half plate keyless movement supplied by Hammersley, jewelled to the 3rd with hard brass setting at the fusee and cap jewels on balance (diamond), escape and 4th wheel. Spring-detent escapement with original black-polished detent, the escape with safety train-locking screw. Top quality compensation balance with quarter timing nuts and duo-in-uno form of helical balance-spring. Signed enamel dial in perfect condition, original blued-steel hands. 58 mm diameter. Together with its lovely 3-piece mahogany Deck Box with plain ivory roundel.
The firm of M F Dent, Charing Cross, London, one of the leading watch, chronometer and clock makers of the period - see the book on Edward John Dent and the various Dent firms by Vaudrey Mercer.
John Hammersley, Clerkenwell, later working in St Albans, a noted maker of chronometers who is known for his use of the duo-in-uno balance spring. He supplied many fine watches to Dent - see the books by Mercer, both Vaudrey and Tony.
Case with discrete 'C' under a coronet engraved crest and some slight signs of wear. Otherwise a fine example of a best quality English pocket chronometer in its lovely English 3-piece box, supplied for private rather than Royal Navy use. Cleaned and guaranteed.
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