Swiss Chrono-Tachymeter Cadran Brevetè Circa 1910

Silver chronograph with 5-colour-multiscale dial by Omega
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A Swiss very big and rare Omega pocket watch chronograph, Cadran Breveté S.G.D.G, with 5-coloured tachymeter scale and register, circa 1910.
Very solid silver case with Omega case punch. Gilt lever movement with elegant chronograph and fine adjusting device. Enamel dial with 5-coloured tachymeter scale, centre chronograph hand and blued steel hands.
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Diameter: 59 mm
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Weight: 148 g
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Signed: Omega Cadran Brevetè S.G.D.G
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S.G.D.G. tachymeter dial.
It enabled the direct reading of all speeds between 10.5 and 140 miles per hour. 15min counter, starting with five different-coloured minute segments as an indication of which colour of the speedometer scale the speed can be read.