Rare Swiss gold enamel chronograph with tachy scale Circa 1919

Gold chronograph with 5-colour-multiscale S.G.D.G. dial by Omega
An extremely rare and important, possibly unique, manual wind, 18K yellow gold chronograph pocket watch with plique à jour green and gold enamel, circa 1919. Made by Archimede Bottazzi and delivered to Italy in 1919.
Plique-a-jour enamel and gold enamel decorated case, repeating slide and chronograph button in the band. Enamel dial with Arabic numerals, minutes/seconds track, subsidiary dial for the constant seconds, 30 minute counter, concentric tachy scale, centre chronograph hand, and gold spade hands. Frosted, gilt 4/5 plate movement with very finely ground chronograph steel parts, ratchet wheel, screw compensation balance, and index spring fine adjusting device.
Dial, case and movement signed. Accompanied by original drawings of the case design and extract from the archives.
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Diameter: 54 mm
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Signed: Omega Cadran Breveté S.G.D.G.
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Ordered by the Count of Capodistilista, an important Italian aristocratic family, by the famous enameller Archimede Botazzi. Today, almost forgotten, he was one of the most important artists at the time and had clients such as D’Annunzio, Edda Mussolini and the Royal Family. According to our research, the King of Italy had ordered a similar piece but had to interrupt his project due to financial problems. Using the plique à jour technique, where the enamel is applied to cells without backing, which allows light to shine through, the intricate case design representing flowers, butterflies and ladybugs contributes to making this one of the most beautiful and decorative pocket watches made in that period.
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S.G.D.G. Tachymeter Dial
The tachymeter dial allows measuring any speed between 10.5 and 140 miles per hour without the help of calculations. 15-minute counters starting with five individual minute segments in different colours to indicate which colour will show the speed on the spiral tachymeter scale.