1996–2006 · 37mm · caliber Philippe Dufour in-house, manual-wind: twin-escapement (two complete lever escapements running simultaneously, connected by differential); 18,000bph; entirely hand-made by Dufour; only 9 known examples
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Movement tier: unclassified · caliber Philippe Dufour in-house, manual-wind: twin-escapement (two complete lever escapements running simultaneously, connected by differential); 18,000bph; entirely hand-made by Dufour; only 9 known examples
Versatile size: fits most wrists (6–7.5 in / 15–19 cm)
37 mm case. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.
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The Duality is one of the rarest watches produced by any living watchmaker. Only 8 known examples exist. Two complete lever escapements run simultaneously, coupled by a differential; this construction is visible through the dial. Any prospective buyer should treat this as an institutional-level acquisition requiring full auction house authentication.
Known issues in the market
With only 8 examples known, provenance documentation is essential; any claimed Duality should have a clear and traceable ownership history.
The twin escapements visible through the dial are the defining authentication point; both should be running simultaneously and visibly in beat.
The Duality predates widespread internet sales; expect significant documentation with any legitimate example.
Area
What to check
What is correct
Red flag
movement
Twin escapements running simultaneously
Both balance wheels visibly oscillating in beat; the differential coupling between them creates a characteristic linked rhythm when viewed through the dial
Only one balance wheel running; erratic or stopped balance; no visible differential coupling bridge
movement
Hand-finishing quality matching Simplicity standard
The same anglage, perlage, and surface finishing standard as the Simplicity; both accessible and non-accessible surfaces are finished to the same level
Any surface that appears machine-finished or less than extraordinary; unfinished interior angles
dial
Dial architecture showing both escapements
The dial is designed around the two escapement apertures; both apertures are symmetrically positioned and the bridges behind them are at the same height
Apertures of different sizes or heights; asymmetrical positioning; any obstruction of one escapement view
case
Case construction and hallmarks
Gold or platinum with correct hallmarks; case proportions consistent with 37mm reference diameter
Missing hallmarks; case dimensions inconsistent with known specifications
Common legitimate replacements
No standard replacement parts exist for the Duality; any modification should be documented.
Expert resources: Auction house authentication (Phillips, Christie's, Sotheby's) is not optional for a Duality transaction. The Duality's rarity means only a handful of specialists worldwide have direct handling experience. Contact auction specialists who have documented sales of Dufour works.
Authentication guide
Last reviewed June 2026
The Duality houses two escapements running in parallel, one for each side of the movement. Fewer than 20 examples exist. Both escapements must run simultaneously for the watch to function correctly. Provenance is the only practical authentication tool.
Known reproduction risks
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LOW
No practical reproduction exists
A dual-escapement movement of this finishing standard cannot be replicated outside the craft at this level
Given fewer than 20 examples exist, any Duality offered for sale should be verified through Dufour's personal records and cross-referenced with known auction appearances before any physical inspection.
Dial variants by era
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Era
Description
Identifiers
Duality production (1990s onward, extremely limited)
37mm case. The dial reveals two balance wheels running simultaneously, one at each end of the movement.
Two balance wheels visible through the dial or caseback
Both wheels running simultaneously
Dufour signature on the movement
Service part flags
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Dual escapement
Original: Two independently running escapements, one on each side of the movement. Both balance wheels visible and running.
Replacement tells
Only one balance wheel present or running
Second balance wheel present but stationary
Any movement architecture other than the Duality's bilateral design
Movement finishing
Original: Same Dufour standard as the Simplicity: hand-filed anglage, mirror-polished surfaces, no machine marks.
Replacement tells
Rounded anglage
Hazy or matte polished surfaces
Any tool marks under loupe
Case back markings
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All production
Philippe Dufour signature on the movement
Serial number per Dufour's personal records
Precious metal purity marking
Movement tells
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Both escapements must run simultaneously; a Duality with one stopped balance wheel is either damaged or not genuine.
Functional verification of dual-escapement operation: watch both balance wheels under a loupe for at least 30 seconds to confirm both are running.
All anglage and polishing checks from the Simplicity apply equally to the Duality.
