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Entry to the Grand Prix d'Horlogerie de Genève is voluntary and made by the brand. An entry is a watch registered for that year's competition, not a jury verdict, and several large houses including Rolex, Patek Philippe and Omega do not take part at all.

Mass-produced#1 in familyOfficial press photos

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Top-tier supplier movement · caliber Customised ETA 2892 + ROCS 1.3 module
Large case: suits wrists 7 in+ (18 cm+)
42.7 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.

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Authentication

The ROCS oil-filled disc assembly must be bubble-free; any bubbles or oil leakage indicate a failed seal requiring Ressence-authorized service.

Known issues in the market
  • Oil bubbles in the ROCS module indicate a seal failure; this is a Ressence-only service item.
  • The ROCS disc assembly floats on the dial; if it appears stuck or does not rotate correctly, the module needs service.
AreaWhat to checkWhat is correctRed flag
dialROCS oil-filled disc assembly conditionClear, bubble-free oil; disc rotates correctly within the assemblyBubbles in oil or evidence of leakage; seal failure requiring Ressence service
dialROCS indication rotationAll indications rotate correctly within the oil-filled assemblyIndication disc stuck or rotating incorrectly; ROCS module fault
casebackRessence serial and referenceRessence serial and reference correctly engravedMissing or incorrect engravings; non-genuine caseback
movementETA 2892 base architectureETA 2892 base visible where accessible; ROCS 1.3 module overlaidNon-ETA 2892 base architecture; movement discrepancy
Common legitimate replacements
  • ROCS module; Ressence authorized service only.
  • Crown; Ressence OEM only.
Expert resources: Ressence authorized service only for ROCS; ressencewatches.com documentation.

Authentication guide

Last reviewed June 2026

The Type 1 Round uses the ROCS 1.3 epicyclic gear module atop a modified ETA 2892. The display rotates within an oil-free sapphire dome (Type 1 is not oil-filled, unlike Type 3). No replica exists; the ROCS module is proprietary and impossible to counterfeit.

Known reproduction risks

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LOW

No known replica. The ROCS epicyclic module is Ressence's proprietary technology and cannot be sourced from any third party. Any claimed Type 1 without the orbiting sub-dial display is not authentic.

  • Conventional hands instead of orbiting sub-dials
  • Flat sapphire crystal instead of domed profile

Verify the ROCS module operates correctly by confirming the sub-dials orbit smoothly for several minutes of observation.

Dial variants by era

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EraDescriptionIdentifiers
2023 to presentRotating display within a domed sapphire crystal: sub-dials for hours, minutes, and day orbit the dial center as the module rotates. Blue or black display with index markers. No conventional hands. Titanium case at 42.7mm.
  • Epicyclic rotating display: sub-dials orbit the center of the sapphire crystal
  • No conventional hands; all indications are on rotating sub-dials
  • Type 1 Round designation on caseback
  • Titanium case at 42.7mm
  • No oil fill (Type 1 is air-filled, not liquid-filled)

Service part flags

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ROCS 1.3 epicyclic module

Original: The ROCS module sits above the base ETA movement and drives the epicyclic gear train that rotates the sub-dials. It is a precision-engineered module unique to Ressence and has no commercially available equivalent.

Replacement tells
  • Sub-dials that do not orbit the center (indicates ROCS module failure or removal)
  • Display that shows conventional hand-driven time reading
  • Sapphire crystal without the characteristic curved dome profile

Case back markings

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2023 to present
  • Ressence Type 1 Round designation
  • Individual serial number
  • Ti material designation
  • 100m water resistance
  • ROCS module reference

Movement tells

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  • The ROCS 1.3 module requires Ressence-trained service; independent watchmakers cannot service the epicyclic train without Ressence-specific tooling and parts.
  • The sub-dials should orbit continuously and smoothly as the watch runs; any juddering or stopped orbit indicates ROCS module service is needed.
  • The base ETA movement is standard and separately serviceable; the ROCS module service is an additional operation.
Sources: Ressence official.

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