Rare, important Swiss gold complicated watch Circa 1912

Minute repeating chronograph with perpetual calendar, register, ages and phases of the moon by Vacheron Constantin
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A rare and important Swiss 18 carat gold open faced keyless perpetual calendar minute repeating chronograph watch with register, ages and phases of the moon, circa 1912. Manual winding nickel lever movement, highly jewelled, bimetallic Guillaume compensation balance, swan neck regulator, repeating on two polished steel hammers onto two gongs. 18 Carat engraved gold cuvette.  White enamel dial, Breguet numerals, four subsidiary dials indicating day, date, months calibrated for leap year combined with 30-minute register, fan form aperture for moon phase combined with ages of the moon, outer calibrated rail track for 1/5 of seconds. Polished case engraved with monogram ‘TJW’, sliding band to the side for minute repeating. Case, dial, cuvette and movement signed.
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Diameter: 52.5 mm
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Signed: Vacheron & Constantin Genève
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Despite a long tradition in the manufacture of complication watches, very few Vacheron Constantin watches with perpetual calendar, minute repetition and chronograph are known. The signature to the dial is most unusual, appearing as it does in full to the base of the dial beneath the outer tracks. The complexity of the dial configuration does not easily allow the placement of the full Vacheron & Constantin signature to the main body of the dial, its transference to the lowest part of the dial is, therefore, a logical design initiative.
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Interestingly, a watch of similar date, complications and design is illustrated in Lambelet & Coen, The World of Vacheron Constantin, p.228, again with a very complex dial, that example does not feature a signature at all.