Rare Swiss silver metal double-dialled driver’s pocket watch Circa 1906

Silver metal open faced lever by Omega
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A fine and rare Swiss, silver metal, keyless double-dialled driver’s pocket watch, circa 1906. With a chronograph, semi-instantaneous 15-minute register for yacht timing and two tachometer scales. Retailed by Kirby Beard & Co. Ld. A polished case, glazed on both sides. White enamel dial, upright dauphine numerals, outer minute/ seconds divisions divided into fifths, sunk 15-minute register the first five minutes in different colours corresponding to the colours of the outermost tachometer scale running from 10.5 to 250 km/h. Pink gold spade hands.
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The other side with white enamel chapter ring printed with a red 1/5th second timing scale and tachymeter graduated from 7-180 kph mm. A frosted gilt movement, 3/4-plate, 15 jewels, straight-line lever escapement, cut bimetallic compensation balance with Breguet balance spring, swan-neck micrometre regulator, the chronograph work is set on a separate plate fastened to the backplate. Dial signed.
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Diameter: 58 mm
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Signed: Omega  Swiss
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The case is slightly worn.