Rare Swiss silver double dialed lever chronograph Circa 1906

Silver double dialed driver’s watch with two tachometer scales by Omega
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A very fine and rare Swiss silver double dialed keyless lever chronograph driver’s pocket watch with semi instantaneous 15 minute register for yacht timing and two tachometer scales, one being Omega’s patented (CH) scale No. 8760, circa 1906. Frosted gilt 3/4 plate movement, 15 jewels, straight-line lever escapement, cut bimetallic compensation balance with Breguet balance spring, swan neck micrometer regulator, the chronograph work is set on a separate plate fastened to the back plate. White enamel dial with upright dauphine numerals, outer minute/seconds divisions divided into fifths, sunk 15 minute register the first five minutes in different colours corresponding to the colors of the outermost tachometer scale running from 10.5 to 250 km/h and original rose gold spade hands. The other side with white enamel chapter ring printed with red 1/5th second timing scale and tachymeter graduated from 7-180 kph mm. Case glazed on both sides. Dial signed.
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Diameter: 58 mm
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Signed: Omega