Roger Dubuis

Excalibur Original CarTech Micro-Melt BioDur CCM®

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Excalibur Original CarTech Micro-Melt BioDur CCM®
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First timepiece ever to be made with CarTech Micro‑Melt BioDur CCM®. This specific and exceptional alloy, made possible thanks to powder metallurgy, gives the timepiece a much better resistance to wear and tear than stainless steel. This alloy is so resistant that it is used in high‑tech industries such as automotive, aeoronautic and aerospace. Another interesting particularity of this alloy is that it always remains bright and shiny, even if it is scratched. That is why they use it in the aerospace so they can collect as much light as possible with the mirror like property of CarTech Micro‑Melt BioDur CCM® but with the strength of metal to resist extreme conditions.


  • RD820SQ Automatic skeleton watch with micro-rotor
  • Self-winding mechanical calibre
  • Power reserve: 60 hours
  • Case: 42mm , Chrome Cobalt Micro-Melt®
  • Boutique exclusive model
  • Limited edition of 28 pieces
  • Stamped with the Poinçon de Genève

components in this calibre


BAR - Water Resistance


hours of power reserve

Poinçon de Genève

The ultimate guarantee of the finest traditional watchmaking. Roger Dubuis makes it a priority, when producing this timepiece, to follow only the most demanding & strictest criteria for quality and craftsmanship.

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Automatic skeleton watch with micro-rotor

The first automatic skeleton watch of Roger Dubuis with micro-rotor movement

About this calibre

Technical specifications

Inner & Outer casing

  • ReferenceRDDBEX0590
  • Case size: 42mm
  • Case:Chrome Cobalt Micro-Melt®
  • Dial:Blue PVD skeleton dial with blue and red flange, red applied indexes, 18K white gold hands with red transfer and white luminous SLN tips
  • Water Resistance:3BAR (30 m)

Strap & Clasp

  • Strap:Blue alligator strap, blue stitching
  • Clasp:Stainless steel 316L and titanium, Adjustable folding buckle


  • Automatic skeleton watch with micro-rotor
  • Power reserve: 60 hours
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