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In-house manufacture caliber · caliber Omega Cal. 3330: Co-Axial automatic chronograph, 28,800bph, 52h PR, 37j; column-wheel, Co-Axial escapement; used in Speedmaster Mark II re-edition · 52h power reserve (2.2 days)
Large case: suits wrists 7 in+ (18 cm+)
42.4 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.

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Authentication

The Mark II cushion case and Cal. 3330 Co-Axial are both specific to the 2014 re-issue; any movement swap to a Lemania or ETA base is a disqualifying find.

Known issues in the market
  • Movement swaps to vintage Lemania-based calibers are the primary fraud vector; Cal. 3330 is Co-Axial and entirely different in architecture.
  • The cushion case profile is unique to the Mark II; any round-case Speedmaster sold as a Mark II is a mislabeled watch.
  • Pushers sit in recessed tubes in the case band; any pusher that protrudes flush with the case band has wrong pusher tubes.
AreaWhat to checkWhat is correctRed flag
movementCaliber identityCal. 3330 Co-Axial with column wheel, 28,800bph, visible through casebackLemania 1873 or ETA base movement; any movement without Co-Axial escapement fork
caseCase profileDistinctive cushion-shaped case with recessed pushers in tubes, not protrudingRound case, or pushers that sit flush with the case band rather than in recessed tubes
dialRegister proportionsThree subsidiary registers properly sized for the Mark II dial layout, printed "Mark II" text correct weightMisaligned registers, incorrect font weight on "Mark II" text, or subdials that do not sit flush in their recesses
Common legitimate replacements
  • Chronograph pushers are replaced on worn examples; Omega-signed pushers confirm originality.
  • Caseback gaskets are a serviceable wear item and do not affect value, but a caseback that will not seal indicates deferred maintenance.
Expert resources: Omega Museum documentation for the Mark II 2014 re-issue. Speedmaster community threads on Omega Forums and WatchUSeek Chronograph sub-forum for Cal. 3330 identification.

Authentication guide

Last reviewed June 2026

The 2014 Mark II reissue brings back the cushion-shaped tonneau case of the original 1969 Mark II. Cal. 3330 is automatic and Co-Axial. The case shape is the single fastest identifier -- the tonneau profile is unlike any other current Speedmaster. No tachymeter on any subdial.

Known reproduction risks

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LOW

Variant confusion with standard round-case Speedmaster

  • Round case instead of tonneau -- the Mark II case shape is non-negotiable
  • Visible bracelet attachment lugs -- the Mark II has an integrated bracelet with no visible attachment

The Mark II 2014 is not a high-volume fake target. The case shape is so specific that misrepresentation as a different Speedmaster model is the primary risk.

Dial variants by era

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EraDescriptionIdentifiers
2014 to 2020 (cal. 3330)Cushion-shaped tonneau case with integrated bracelet design. Black dial with three registers, date window, and no tachymeter on any subdial (the original Mark II had no tachymeter on the counters). The tachymeter scale, if present, appears on the bezel. "Speedmaster Mark II" text on the dial.
  • Cushion tonneau case shape -- rounded rectangular, not round
  • "Mark II" text on the dial confirming the specific reference
  • Three subdials with date window
  • No tachymeter scale on the subdials -- a Mark II with counter-based tachymeter is misrepresented
  • "Co-Axial" designation on the dial (not "Master Chronometer" -- cal. 3330 predates METAS)
  • Integrated bracelet with no visible lug attachment point

Service part flags

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Case shape and bracelet integration

Original: The tonneau case with integrated bracelet is the defining design element. The bracelet flows directly from the case end links with no visible separation point. Aftermarket bracelets or replacement cases from round Speedmaster variants will not achieve this seamless integration.

Replacement tells
  • Visible gap between the bracelet end link and the case
  • Round-case Speedmaster components fitted into a claimed Mark II configuration
  • Bracelet link profile does not match the correct Mark II integrated design
Caliber 3330

Original: Cal. 3330 is automatic with a Co-Axial escapement (predates Master Chronometer). It is not METAS-certified. The caseback will not carry "Master Chronometer" text -- this is correct for the 2014 Mark II.

Replacement tells
  • "Master Chronometer" on a 2014 Mark II caseback -- incorrect for cal. 3330
  • Manual-wind only -- the 3330 is automatic; a crown that does not wind automatically has a rotor issue
  • Movement architecture inconsistent with the cal. 3330 Co-Axial layout

Case back markings

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2014 to 2020
  • Caliber 3330 designation
  • "Co-Axial" text -- not "Master Chronometer"
  • "100 M / 330 FT" water resistance
  • Case reference and serial number
  • "OMEGA" and "SWISS MADE"

Movement tells

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  • Cal. 3330 is automatic with a bidirectional rotor. Power reserve is approximately 52 hours. The Co-Axial escapement is present but the watch is not METAS-certified.
  • The chronograph uses a column wheel and Co-Axial vertical clutch. The seconds hand should engage instantly on start. A sluggish start indicates clutch wear.
Sources: Omega Speedmaster official; WatchUSeek Omega forum.

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