Swiss observation chronometer with power reserve Circa 1910

Deck chronometer with 40h power reserve by Zenith
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An early Swiss observation chronometer with 40 hour power reserve, circa 1910.
Anchor chronometer with 40 hour power reserve, and second stop with pen tool. Metal case, screwed bezel.3-part mahogany box. Silvered dial with Roman numerals for the PM time, Arabic numerals for the AM time, outer minutes track, subsidiary dial for the seconds, 40 hour power reserve indicator, and blued steel hands. Dial, box, and movement signed.
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Dimensions box: 110 x 150 x 190 mm
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Signed: Zenith