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Authentication
The in-house Cal. 28 bridges must show hand-done Cotes de Geneve with natural variation under a loupe; machine-regular finishing is not consistent with Voutilainen standards.
- Cal. 28 is the in-house caliber family; the architecture through the caseback is proprietary and distinctive.
- Machine-regular Geneva stripes indicate a non-genuine or refinished movement.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Cal. 28 in-house architecture through caseback | Proprietary Voutilainen Cal. 28 architecture; not ETA or Sellita-based | ETA or Sellita architecture through caseback; movement swap |
| movement | Hand-done Cotes de Geneve on bridges | Natural variation in Geneva stripe spacing and depth under a loupe | Machine-regular stripe spacing and depth; non-genuine or refinished movement |
| movement | Blued screws throughout | Hand-blued screws with consistent finish | Unblued or mixed-finish screws; non-genuine or partially replaced components |
| caseback | Voutilainen serial and Vingt-8 reference | Voutilainen serial and reference correctly engraved | Missing or incorrect engravings; non-genuine caseback |
- No serviceable parts outside Voutilainen workshop.
Authentication guide
The Vingt-8 is Voutilainen's core reference: a 38.5mm dress watch powered by the Cal. 28 movement with 28 jewels. Production is approximately 50 watches per year total across all references. No replica exists; provenance and dealer documentation are the authentication foundation.




