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The Roger Dubuis Excalibur Biretrograde Perpetual Calendar Watch RDDBEX1178 | Roger Dubuis is a luxury mechanical wristwatch. The dial is transforms these classical com. Powered by a RD850 At the heart of this tim movement. It wears on a Clasp Pink gold strap/bracelet. On the secondary market across 1 active listing. When buying pre-owned, check condition grade, box and papers (typically a 10–20% premium), service history, and originality of dial and hands. Use the listings and price history on this page to benchmark fair market value.