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In-house manufacture caliber
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.
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Authentication
The Observatoire must demonstrate accuracy of +/-2 seconds per day or better; verify with a smartphone timing app over several days before purchase.
Known issues in the market
- Observatory-grade regulation is the standard claim; verify accuracy over several days before purchase.
- The V-18 movement finishing must show hand-done Cotes de Geneve and perlage; machine-regular finishing is non-genuine.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Observatory-grade accuracy verification | +/-2 seconds per day or better measured over at least 3 days | Accuracy worse than +/-2 sec/day; regulation has drifted; service or adjustment needed |
| movement | V-18 hand-done Cotes de Geneve and perlage | Hand-done Geneva stripes and perlage with natural variation under a loupe | Machine-regular finishing; non-genuine movement |
| movement | Actual power reserve from full wind | At least 54h actual run time (90% of 60h claim) from full wind | Less than 54h; worn mainspring or regulation issue |
| caseback | Voutilainen serial and Observatoire reference | Voutilainen serial and reference correctly engraved | Missing or incorrect engravings; non-genuine caseback |
Common legitimate replacements
- No serviceable parts outside Voutilainen workshop.
Expert resources: Voutilainen workshop; voutilainen.fi for provenance verification.
Authentication guide
Last reviewed June 2026
The Chronomètre Observatoire uses the Caliber V-18 regulated to observatory-grade precision. A 40mm steel case with cream or silver dial and Roman numerals. One of the most precision-oriented references from Voutilainen; service history matters as much as condition.
Sources: Voutilainen official.





