Swiss double sided chronograph pocket watch Circa 1905

Silver skeletonized Chrono-Tachymeter by Omega
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A rare double sided Swiss gentleman’s pocket watch with chronograph and polychrome S.G.D.G. dial and tachy scale – with original box, circa 1905.
The case of this rare watch is silver polished. It has two dials: front dial – enamel, Arabic numerals, 15 min. counter, concentric tachy scale, spade hands; back dial – outer tachy scale and 15 min. counter, skeletonized centre, blued single spade hand. And the 3/4 plate movement is frosted, gilt, with very finely ground chronograph steel parts, ratchet wheel, screw compensation balance and an index spring fine adjusting device.
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Diameter: 57 mm
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Weight: 146 g
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Signed: Omega, Kirby Beard & Co. Ld. Omega Cadran Brevetè S.G.D.G.
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S.G.D.G. Tachymeter Dial
The tachymeter dial allows the measuring of any speed between 10.5 and 140 miles per hour without the help of calculations. 15-minute counters starting with 5 individual minute segments in different colours to indicate which colour will show the speed on the spiral tachymeter scale.