Cecil Clutton included this watch in his book "Collector's Collection" where he notes that he gave the chronometer to George Daniels who "took it to task after which it ran for 2 1/2 weeks +2 and -2 seconds a day." Clutton also notes that, in his opinion, this chronometer is "of the highest quality, fully equal of anything executed in the life-time of John." This watch is one of three or four watches recorded where Arnold has fitted an Earnshaw type of spring detent escapement to one of his movements. It is otherwise typical, with a ‘Z’ balance, gold helical spring, standard signature and a griffin displayed on the cock. The four-arm escape wheel follows Earnshaw’s early tooth profile but made in the Arnold manner where much more of the wheel has been cut away for lightness. The detent is typically Arnold (only the reverse of normal) and has a side fitting jewel. The detent mounting is similar to Earnshaw’s, consisting of a brass arm and block for depth adjustment, but half of the block pivots on a rivet, with two pairs of opposing screws for the left/right adjustment.
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