Swiss gunmetal and pink gold chronograph watch Circa 1910

Gunmetal chronograph with 30-minute register
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A Swiss gunmetal and 18K pink gold keyless pocket watch, circa 1910. With chronograph and semi instantaneous 30 minute register. White enamel dial, Paris numerals, outer minute/seconds divisions divided into fifths, outermost fifth second timing scale with Arabic five minutes, sunk 30 minute register, subsidiary seconds and gold spade hands. A frosted gilt movement, 3/4 plate, 15 jewels, straight-line lever escapement, cut bimetallic compensation balance with Breguet balance spring, swanneck micrometre regulator, the chronograph work is set on a separate plate fastened to the back plate. Dial and case signed. This watch is sold with a box and certificate of authenticity.
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Diameter: 55 mm
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Signed: Omega  Swiss