Swiss keyless lever compass with day and night dial Circa 1927

Silver and rose gold Compass Lépine
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A fine and very unusual Swiss silver and rose gold capped keyless lever pocket watch, circa 1927. Matte gilt movement (calibre 19 LOB), 15 jewels, a straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring with overcoil, swan-neck micrometre regulator. A hinged silver cuvette engraved with the prize medals. White enamel 24-hour day and night dial, the lower half in a darker tone to indicate the night-time hours, radial Arabic numerals 1-12 and 13-24, inner red supplementary numerals 1-12, an outer minute track with individual Arabic numerals 1-10 for each 10-minute section, red 10-minute numerals, the points of the compass after Swiss patent No. 30613, subsidiary seconds and rose gold spade hands, the hour hand making one full rotation in 24 hours. This kind of 24-hour dial allows the determination, in good weather, of the compass points, simply by pointing the hour hand towards the sun. The engine-turned case back with a central foliate cartouche and engraved monogram, a polished gilded bezel, band and border. Dial, case, cuvette and movement signed, the case with Swiss and German silver marks, case and movement numbered. Accompanied by a period Omega presentation box.
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Diameter: 51 mm
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Signed: Omega
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Reference GS 141 LT.