Typical early Arnold fullplate movement ‘of the best sort’ with pierced and engraved cock, jewelled to the 3rd, with cap jewels on balance (diamond) and escape, the fusee with Arnold’s rare transitional form of maintaining power. Now with Arnold’s spring-detent detached escapement, the footed detent mounted within a slot in the top plate, being a conversion by the firm from the original pivoted-detent. Arnold’s ‘OZ’ compensation balance, replacing the original compensation-curb, gold helical balance-spring with terminal curves. Original and beautiful one-piece signed enamel dial, blued-steel hands. 64.5 mm diameter. Now in a correct style of early consular silver case made for Hans Staeger by the late Martin Matthews, hallmarked 2001, and certainly one of his best cases. Together with a lovely later two-piece box, also made for Staeger.
John Arnold, arguably the most important of all the early ‘heroic period’ of English chronometer makers, later working with his son, John Roger, who was apprenticed to and retained strong connections with the Breguet workshop. NB: Such early chronometers, with John Arnold working on his own, are now almost unobtainable, this example being the sixth earliest example known to have survived – numbers 3 and 11 being at the British Museum.
At one time in the Seth Atwood (Time Museum) and Hans Staeger collections. As wonderful a piece of important horological history as one is ever likely to find, even noting the later changes which, please note, almost all surviving early Arnold chronometers have undergone. Serviced and guaranteed – a once-in-a-lifetime opportunity.