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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.

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In-house manufacture caliber · caliber DB2115v4 (hand-wound, in-house, balance with silicon/platinum inertia weights)
Large case: suits wrists 7 in+ (18 cm+)
43 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.

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Authentication

The XP designation means extra plat (extra flat); any DB28 with the same thickness as a standard DB28T is the non-XP version.

Known issues in the market
  • The DB28XP's slim profile is visually apparent next to the standard DB28T; thickness measurement confirms the variant.
AreaWhat to checkWhat is correctRed flag
caseExtra-slim case profileVisibly slimmer case profile than standard DB28T; XP is notably thinnerCase thickness matching standard DB28T; non-XP movement or wrong reference
movementDB2115v4 movement with silicon/platinum balanceDB2115v4 in-house movement visible through caseback; silicon/platinum balanceNon-DB2115 movement architecture; non-genuine movement swap
casebackDB28XP serial and documentationMatching serial number and original De Bethune DB28XP certificateMissing or non-matching documentation; requires expert authentication
Common legitimate replacements
  • No common replacements; De Bethune parts are proprietary.
Expert resources: De Bethune directly; specialist independent watch authenticators.

Authentication guide

Last reviewed June 2026

The DB28XP is De Bethune's ultra-thin statement: a 43mm case at only 7.2mm height, featuring the spherical moonphase and small seconds. Caliber DB2115v4 with silicon-platinum inertia weights on the balance. Condition is the primary concern; no meaningful replica exists.

Known reproduction risks

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LOW

No known replica. The spherical moonphase, silicon escapement, and 7.2mm case architecture are impossible to replicate outside De Bethune.

  • Any DB28XP with a flat moonphase disc is either a different reference or not authentic
  • A case thicker than 8mm is inconsistent with the XP specification

The extreme thinness makes the DB28XP susceptible to case flex and crystal stress; inspect the crystal carefully for any micro-cracks at the edges.

Dial variants by era

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EraDescriptionIdentifiers
2020 to presentMinimalist dial with Roman numerals, a small spherical moonphase display, and small seconds at 6 o'clock. Case in titanium, white gold, or rose gold. The extreme thinness (7.2mm) is the defining physical characteristic.
  • Case height of 7.2mm: measurably thinner than most dress watches
  • Spherical (three-dimensional) moonphase ball visible at 12 o'clock
  • DB28XP designation on caseback and documentation
  • Silicon/platinum bi-metallic balance wheel visible at service
  • Roman numerals on a restrained dial

Service part flags

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Spherical moonphase

Original: The De Bethune moonphase displays as a three-dimensional sphere, not a flat disc with an aperture. The sphere is typically in steel or ruthenium with a blued or polished surface. It rotates to display the lunar cycle.

Replacement tells
  • A flat moonphase disc instead of a three-dimensional sphere
  • Sphere that does not rotate or tracks the lunar cycle inaccurately
  • Sphere color inconsistent with documented De Bethune moonphase materials
Case thickness

Original: The 7.2mm case height is an engineering achievement. A case that measures significantly thicker has likely been altered or is not genuine.

Replacement tells
  • Case height measuring more than 8mm indicates a different reference or case modification
  • Crown at 3 o'clock that protrudes beyond the typical De Bethune profile

Case back markings

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2020 to present
  • DB28XP designation
  • Individual serial number
  • Ti, 750WG, or 750RG material designation
  • De Bethune name
  • 30m water resistance

Movement tells

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  • The DB2115v4 caliber uses a silicon escape wheel and silicon balance spring; at service, these components should be handled only by a De Bethune-trained technician as silicon is not repairable, only replaceable.
  • The bi-metallic balance wheel with silicon and platinum inertia weights is a specific visual identifier at service; confirm the composition matches the DB28XP specification.
  • At 7.2mm case height, servicing requires special tools; a case that shows signs of improper opening (tool marks, bent crown tube) has likely been opened by an unqualified technician.
Sources: De Bethune official.

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