English watch 24 hour dail and power reserve Circa 1891

Rare pocket chronometer with rare 24-hour dial with power reserve
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An English rare and unusual large silver open-faced pocket chronometer with rare 24-hour dial and power reserve indication, circa 1891. Lancashire size gilt full plate movement, spring detent escapement, reverse fusee, free-sprung, bimetallic compensation balance with gold screws, blued steel helical spring, diamond endstone, jewels in screwed settings. White enamel 24-hour dial by Willis, Arabic numerals, outer minute track, subsidiary dial for up-and-down, large subsidiary seconds dial, and blued steel hands. Polished case, the back engraved B.T.O.N., plain pendant and bow. Case makers mark FT for Fred Thoms, dial and movement signed.
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Diameter: 62 mm
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Signed: A. Ericsson St. Petersburg
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August Ericsson, born in Sweden, is recorded as working in St. Petersburg as a chronometer maker. Victor Kullberg supplied him with approximately 130 deck chronometers and likely many more marine chronometers. This watch appears in Kullberg’s workbooks as Kullberg’s number 5347. The pillar plate, below the dial, stamped with the ebauche maker’s mark J.P. for Joseph Preston and  Sons. The present watch’s dial is a superb example of Willis at his finest. The 24-hour dial is an unusual feature. The up/down indication is small enough that it does not interfere with the 24-hour chapter and the subsidiary seconds dial is designed to be large enough so that it remains legible. The integration of the three features (the hour ring, up/down, and subsidiary seconds) in this manner was certainly quite a task, however, it has been done in such a way to still be clear.