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In-house manufacture caliber · caliber Cal. 28 GMR (hand-wound, in-house)
Versatile size: fits most wrists (6–7.5 in / 15–19 cm)
39 mm case. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.

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Authentication

Voutilainen produces fewer than 50 pieces per year; provenance verification is mandatory, and the Cal. 28 GMR finishing must show hand-done Cotes de Geneve and blued screws under a loupe.

Known issues in the market
  • Fewer than 50 pieces per year across all references; provenance is verifiable for every piece.
  • Machine-regular finishing on bridges or a missing blued screw indicates a non-genuine movement.
AreaWhat to checkWhat is correctRed flag
movementCal. 28 GMR hand-done Cotes de GeneveHand-done Cotes de Geneve with natural variation in line spacing visible under a loupeMachine-regular or perfectly uniform Geneva stripes; non-genuine movement
movementBlued screws on movement bridgesHand-blued screws with consistent blue oxide finish throughoutUnblued, silver, or mixed-finish screws; non-genuine or partially replaced movement
dialGMR dual-time indication configurationHome time and local time shown separately; consistent with GMR documentationIncorrect indication configuration; non-genuine or wrong reference dial
casebackVoutilainen serial and GMR referenceVoutilainen serial and reference correctly engravedMissing 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 GMR adds a GMT display and power reserve indicator to the Cal. 28 architecture. A 39mm dress watch in gold or platinum. One of Voutilainen's more complex references; provenance from an authorized dealer is essential.

Known reproduction risks

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LOW

No known replica. The Cal. 28 GMR caliber is unique to Voutilainen; the GMT and power reserve architecture cannot be sourced or assembled outside the atelier.

  • Any GMR with a non-functioning GMT hand or power reserve is mechanically compromised, not a reproduction

Verify the GMT function operates in one-hour increments and that the power reserve is calibrated to 60 hours.

Dial variants by era

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EraDescriptionIdentifiers
2018 to presentSilver, salmon, or blue lacquered dial with Roman numerals and a GMT hand in contrasting color. Power reserve indicator subdial integrated into the dial layout. Small seconds at 6 o'clock.
  • GMT hand in contrasting color to main hands
  • Power reserve indicator arc on dial
  • Small seconds subdial at 6 o'clock
  • "GMR" designation on dial
  • Cal. 28 GMR designation in movement

Service part flags

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GMT hand

Original: The GMT hand is typically in a contrasting color (often blued or red-tipped) and is distinctly slender to differentiate from the main hour hand.

Replacement tells
  • GMT hand with a profile or taper inconsistent with Voutilainen hand making
  • GMT hand color that does not match documented variants for the specific dial reference
Power reserve indicator

Original: The power reserve arc is printed or engraved on the dial and corresponds to a subsidiary hand driven by the mainspring state. The indicator should be calibrated to the 60-hour reserve of the Cal. 28 GMR.

Replacement tells
  • Power reserve indicator hand that does not respond to crown winding
  • Indicator arc with printing inconsistencies

Case back markings

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2018 to present
  • Individual serial number on caseback
  • "Voutilainen GMR" designation
  • Case material mark (750 for gold; Pt for platinum)

Movement tells

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  • The Cal. 28 GMR is more complex than the base Cal. 28; the GMT module and power reserve add components that require careful lubrication at service.
  • The GMT function should operate in one-hour steps, not continuously; if the GMT hand drifts between hours, the GMT mechanism needs adjustment.
  • Power reserve function should read accurately against a known charge time; a significant discrepancy points to a mainspring issue.
Sources: Voutilainen official.

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