Roger Dubuis Excalibur 36 Automatic Skeleton RDDBEX0967 | Grail Atlas
Roger Dubuis
Excalibur 36 Automatic Skeleton
Ref. RDDBEX0967
2019–present · 36mm · caliber Roger Dubuis Cal. RD821 -- in-house automatic skeleton, 28,800bph, 60h PR; petal-cut openwork through the full movement; Geneva Seal certified
↓7.4%eBay asking prices. Condition and box/papers status not filtered.
Down 7% over the past 90 days
Based on eBay sales, last 12 months
Condition affects price
Pre-owned watches trade across a wide condition spectrum. These ranges are typical for the secondary market.
New Old Stock
Unworn example retaining original packaging, tags, and warranty documentation.
$27,145–$31,322
+30–50% vs median
Unpolished
Worn but the case has never been polished; original brushed and polished surfaces are intact.
$24,013–$26,101
+15–25% vs median
Polished
Case has been professionally or amateur polished at some point; edge definition is softened.
$17,749–$19,837
-15 to -5% vs median
Recently Serviced
Movement has been recently serviced with documented service records; case condition varies.
$20,881
At median
Movement tier: unclassified · caliber Roger Dubuis Cal. RD821 -- in-house automatic skeleton, 28,800bph, 60h PR; petal-cut openwork through the full movement; Geneva Seal certified
Small case: suits slender wrists (under 6.5 in / 16.5 cm)
36 mm case. A compact, elegant wear. Particularly at home on narrower wrists where larger cases can overhang.
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The Geneva Seal guarantees hand-done finishing on every component; verify Geneva stripes and beveled edges on the RD821 movement under a loupe.
Known issues in the market
The Geneva Seal requires re-certification after each service; any Excalibur without current papers may have had an uncertified service.
Petal-cut skeletonized architecture must show Geneva stripes and beveling under a loupe; machine-regular finishing is non-compliant.
Area
What to check
What is correct
Red flag
movement
Geneva Seal finishing on RD821 movement
Hand-done Geneva stripes and beveled edges visible on movement components under a loupe
Machine-regular or unfinished surfaces; Seal standards not met or non-genuine movement
dial
Skeletonized petal-cut architecture
Petal-cut skeletonized bridges visible through the dial
Non-petal or non-skeletonized architecture; wrong model or non-genuine
caseback
Roger Dubuis serial and Geneva Seal hallmark
Serial, reference, and Geneva Seal hallmark correctly applied
Missing Geneva Seal hallmark on caseback or papers; uncertified or non-genuine
Authentication guide
Last reviewed June 2026
The Excalibur 36 brings the skeleton automatic format into a 36mm case with the Geneva Seal-certified RD821 caliber. Authentication follows the same Geneva Seal finishing check as the larger Excalibur pieces.
Known reproduction risks
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HIGH RISK
Non-Geneva Seal skeleton movement in an Excalibur case shell.
Machine marks under loupe
Bevels brushed rather than polished
Petal-cut pattern inconsistent with the RD821 bridge layout
MEDIUM
Full-size rotor replacing the correct micro-rotor.
Large center-mounted rotor visible through caseback or skeleton dial opening
Excalibur 36 double-crown case architecture consistent with RDDBEX0967
Single-crown or incorrect case profile; wrong model
Common legitimate replacements
Strap; Roger Dubuis OEM rubber/leather only.
Crystal; sapphire standard.
Expert resources: Roger Dubuis authorized service; Geneva Seal certification documentation.
2019 to present
Petal-cut skeleton dial with openwork through the full movement; RD821 automatic with micro-rotor; Arabic numeral chapter ring at the periphery.
Petal-cut openwork design: the dial apertures follow a petal or flower-blade shape rather than simple rectangular openings
Arabic numerals on the chapter ring are applied and stand proud of the ring surface
Case diameter 36mm; noticeably smaller than the 42 or 45mm Excalibur pieces
Round case with octagonal inner bezel ring, consistent across the Excalibur family
Service part flags
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Geneva Seal finishing
Original: RD821 carries the Geneva Seal; same finishing standards as the larger Excalibur calibers: polished chamfers, circular graining, no machine marks.
Replacement tells
Machine marks under 5x loupe
Bevels not mirror-polished
Geneva Seal stamp absent on movement plate
Chapter ring numerals
Original: Applied Arabic numerals at 12, 3, 6, and 9 positions (or full set depending on variant); numerals are three-dimensional, not printed.
Replacement tells
Printed flat numerals on a flat ring
Numeral font inconsistent with the rest of the dial typography
Case back markings
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2019 to present
Sapphire caseback showing RD821 caliber
Geneva Seal stamp on movement plate
Reference "RDDBEX0967" on inner case ring
"ROGER DUBUIS GENEVE" on movement bridge
Movement tells
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The RD821 micro-rotor should oscillate smoothly in both directions; feel for roughness or a catch point.
Power reserve is 60 hours; a movement stopping before 48 hours from full wind indicates a service need.
Under loupe, the petal-cut bridges should have clean, polished edges all the way to the aperture perimeters; any rough edge at the skeleton opening indicates non-original finishing or a replacement movement.
