Swiss gold open faced keyless pocket watch Circa 1900

Gold lever by Longines
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A Swiss 18K yellow gold open faced keyless pocket watch, circa 1900. A solid, polished case, hinged case back and a round bezel. White enamel dial with applied black Arabic numerals, outer minute track. Subsidiary seconds dial and blued steel spade hands. Frosted gilt movement, 15 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator.
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Thickness: 10 mm
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Diameter: 30 mm
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Signed: Longines  Saint-Imier
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The case is worn.
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Compagnie des Montres Longines, Francillon S.A. or simply Longines is a Swiss luxury watchmaker based in Saint-Imier, Switzerland.
Founded by Auguste Agassiz in 1832.