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The sky, measured to perfection.​ The Roger Dubuis Excalibur Biretrograde Perpetual Calendar distils the most demanding traditions of Geneva watchmaking into 40 mm of pink gold. At the heart of this piece lies the retrograde, the very first signature of the Maison, co-patented by the founder himself in 1989. Its perpetual calendar accounts for months of 28, 30 and 31 days without correction, expressed through a biretrograde display that brings mechanical poetry to the reading of time.​ ​ An astronomical moonphase, accurate to within one day over 122 years, completes this celestial portrait. Open-worked and structured across nine layers, the dial in Astral Blue transforms these classical complications into something resolutely present.​ ​ Calibre RD850. Poinçon de Genève certified.​ #RogerDubuis #ArtOfTimeIndia