Swiss stainless steel multiscale chronograph Circa 1940

Stainless steel unusual chronograph 
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An unusual stainless steel multiscale chronograph with extract from the archives made by Omega S.A. in La Chaux-de-Fonds, Switzerland, circa 1940. The numbered open faced case of this watch was crafted from steel. The two tone dial has black Arabic hours, an outer minute track with fifth of a second division and Arabic five minute numerals, an outermost blue tachymeter scale, an inner red telemeter scale, a 30 minute counter at 12 o’clock, subsidiary seconds at 6 and blued steel syringe hands. The numbered movement is fitted with a gilt lever escapement and 17 jewels.
The case, dial and movement are signed.
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Diameter: 50 mm
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Signed: Ω Omega
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The Second World War reference mentioned in the attached extract from the archives is extremely rare. Only two other similar examples to the watch presented here exist: one with a silver dial and a second with a black dial.