Swiss pocket watch with digital jumping 24h display Circa 1890

Steel open faced pocket watch by Erland / Joseph Schwob-Weill
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A Swiss gentleman’s pocket watch, circa 1890, with digital jumping 24h display which shows an alternation of the hour display from Roman hours I-XII to Arabic hours 13-24.
The polished case is made of blued steel and has an adjusting button for changing the numerals at 11. The signed dial is silvered with twelve apertures showing the hours in Arabic / Roman numerals, auxiliary seconds, and blued steel hands. And the gilt bridge movement has a screw compensation balance and a counterpoised lever.
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Diameter: 52 mm
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Weight: 98 g
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Signed: Erland