Swiss silver lever watch with 24 hour day and night dial Circa 1910

Silver very unusual keyless pocket watch
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A fine and very unusual Swiss silver open faced keyless pocket watch with 24 hour day and night dial featuring the points of the compass, after Swiss patent No. 30613, made by Omega, circa 1910. Matte gilt movement with 15 jewels, a straight line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring with overcoil and an index regulator. White enamel dial with the lower half in a darker tone to indicate the nighttime hours, Arabic numerals, inner red supplementary numerals 1-12, an outer minute track with the four points of the compass in red, outer minutes individually numbered 1-9 between each red 10 minute numeral, subsidiary seconds at 6 o’clock and gold spade hands. The case with a polished gilded bezel, band and border, the back engine turned and with a central foliate engraved cartouche monogrammed EL. A hinged silver cuvette engraved with prize medals. Dial, case, cuvette and movement signed, movement and case numbered, the case with further Swiss and German silver marks.
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Diameter: 51 mm
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Signed: Ω Omega