Swiss 14k gold double sided astronomical watch Circa 1910

Gold hunting cased quarter repeater
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An extremely heavy and very rare Swiss 14 carat gold hunting cased quarter repeating double sided astronomical Calendrier Breveté, circa 1910. Lever movement, repeating the hours and quarters. Plain à goutte case with double side fly spring mechanism. White enamel dial with Roman hours and Arabic minutes, lunar phase to the front, to the backside a complicated calendar with weekdays, month and date.
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Diameter: 60 mm
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Weight: 200 g
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Signed: No Name
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This watch is probably the rarest and most valuable Calendrier Breveté ever offert in auction. Most of such watches are made of iron or silver with open face, extremely rarely with repeater.