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Movement tier: unclassified · caliber Montblanc Cal. MB 24.15: in-house automatic, 28,800bph, 42h PR, 26j; used in 1858 Auto; clean simple movement in tool watch aesthetic · 42h power reserve
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

Minerva-derived movement finishing with blued screws is the key check; unfinished bridges indicate a movement swap.

Known issues in the market
  • Blued screws and hand-finished bridges visible through caseback are Minerva-heritage markers; any unfinished bridges indicate a movement swap.
  • Verify the specific complication (tourbillon, exo-tourbillon) matches the listed reference; Montblanc makes multiple Chronometrie variants.
AreaWhat to checkWhat is correctRed flag
casebackMinerva movement finishingBlued screws, hand-finished bridges with Minerva-heritage architecture visible through casebackUnfinished bridges; no blued screws; movement swap indicator
dialComplication verificationSpecific complication (tourbillon or exo-tourbillon) matches reference descriptionWrong complication for listed reference; misidentified model
caseCase surface qualityPolished and brushed surfaces in correct areas for Heritage Chronometrie designOver-polished case; original surface character removed
Common legitimate replacements
  • Leather strap; Montblanc OEM.
  • Crystal; sapphire standard.
Expert resources: Montblanc Heritage Chronometrie product documentation; Montblanc authorized service.

Authentication guide

Last reviewed June 2026

The Heritage Chronométrie Automatic uses the MB 24.15 manufacture caliber; the COSC chronometer certification, white or silver dial, and Montblanc dress watch finishing are the anchors.

Known reproduction risks

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LOW

The Heritage Chronométrie is a dress reference; not a significant reproduction target.

  • COSC text on dial should be crisp and consistent font weight with the other dial text.
  • MB 24.15 caliber and Montblanc-signed rotor through caseback.

Dial variants by era

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EraDescriptionIdentifiers
2014 to presentWhite or silver dial with Arabic numerals; small seconds at 6 o'clock on some variants; slim 11.55mm case height; 40mm case.
  • HERITAGE CHRONOMETRIE on dial
  • MB 24.15 on caseback
  • COSC CERTIFIED or CHRONOMETRIE text on dial
  • Arabic numerals
  • Small seconds at 6 on small-seconds variant

Service part flags

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COSC certification

Original: COSC certification means the movement was tested to -4/+6 seconds per day; this is a movement-level certification and is permanent.

Replacement tells
  • A movement that runs outside COSC tolerances has either degraded or been replaced; COSC text on the dial is accurate for the original movement only.
  • If the movement is replaced with a non-COSC caliber, the dial text becomes inaccurate.
Crown

Original: Montblanc star-signed crown; push-pull.

Replacement tells
  • Unsigned crown.

Case back markings

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2014 to present
  • MONTBLANC HERITAGE CHRONOMETRIE
  • MB 24.15 caliber designation
  • SWISS MADE
  • COSC CERTIFIED may appear on movement or caseback
  • 30M WATER RESISTANT
  • Display caseback standard

Movement tells

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  • The MB 24.15 is a Montblanc manufacture automatic; the Montblanc star and CHRONOMETRIE finishing should appear on the movement plate.
  • COSC certification covers the movement as shipped; a serviced movement that has had parts replaced may no longer hold COSC tolerances.
  • At 30m water resistance, this is a dress watch; the crown seals are not rated for significant submersion.
Sources: Montblanc Heritage Chronométrie.

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