GrailAtlasAn independent mechanical watch reference
Español

Entry to the Grand Prix d'Horlogerie de Genève is voluntary and made by the brand. An entry is a watch registered for that year's competition, not a jury verdict, and several large houses including Rolex, Patek Philippe and Omega do not take part at all.

Mass-produced#1 in familyOfficial press photos

What it was up against

Live pricing is coming soon. Get notified when it is available for this reference.

Top-tier supplier movement · caliber Mido Caliber 80: ETA C07.651 base (date display variant), 21,600bph, 80h PR, 21j; used in Commander Big Date; big date aperture module · 80h power reserve (3.3 days)
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
42 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

Not yet rated

Community + OSINT signals haven’t landed for this reference yet. We don’t publish a rating against zero signal: the number would mean nothing. Editorial body + caliber + market value still surface above; ratings appear once the signal corpus does.

Search pre-owned listings

Chrono24
eBay (sold listings)
WatchBox

Authentication

Both date discs must advance simultaneously at midnight; partial advance indicates the date mechanism needs service.

Known issues in the market
  • The big date mechanism uses two separate discs; simultaneous advance is the functional check.
  • Any partial advance or lagging disc indicates the date mechanism needs service or adjustment.
AreaWhat to checkWhat is correctRed flag
dialBig date simultaneous advanceBoth date discs advance simultaneously at midnight; no lag between the two discsOne disc advances before the other; date mechanism needs service
casebackCal. 80 architectureETA C07.651 date-variant architecture through the casebackNon-ETA architecture; movement swap
dialBig date aperture clarityBoth date digits fully visible and legible through the aperture at 3Partially obscured date digits; aperture alignment issue
Common legitimate replacements
  • Leather or steel bracelet; Mido OEM.
  • Crystal; sapphire standard.
Expert resources: Mido authorized service; Mido Commander Big Date product documentation.

Authentication guide

Last reviewed June 2026

The Commander Big Date uses the ETA 2836-2 with a big date module; the aperture at 12 shows two digit discs simultaneously, which is the visual signature of a big date. The disc positioning and print clarity are authentication checkpoints for the complication.

Known reproduction risks

toggle
LOW

Commander Big Date is not a high-value reproduction target.

  • Big date aperture showing two distinct disc positions is the functional authentication test; a single date disc is a different movement

Dial variants by era

toggle
EraDescriptionIdentifiers
2015 to presentDress-sport watch with big date complication at 12 o'clock; multiple dial colors.
  • Big date aperture at 12: two date discs visible simultaneously showing tens and units digits
  • "MIDO" and "COMMANDER" on dial
  • Applied indices; typically silver or gold-toned on various dial colors
  • Exhibition caseback showing movement
  • "SWISS MADE"

Service part flags

toggle
Big Date Module

Original: Dual date discs; clean changeover at midnight; crisp printing on both discs.

Replacement tells
  • A single-digit date aperture on a claimed Commander Big Date is wrong; the big date is always dual-disc
  • Partial or slow date change (one disc advances before the other) indicates a worn or dirty date mechanism
  • Blurry date printing on one disc but not the other suggests a disc replacement with incorrect part

Case back markings

toggle
2015 to present
  • "MIDO" and "COMMANDER" on caseback
  • Caliber designation (ETA 2836-2 or Mido-branded equivalent)
  • "SWISS MADE"
  • Serial number
  • Water resistance rating (typically 50M)

Movement tells

toggle
  • ETA 2836-2 is a well-supported caliber; any watchmaker familiar with ETA movements can service it.
  • After service, confirm the big date module is correctly installed; misaligned discs produce a split date read.
  • The Mido rotor should be present; an unbranded ETA rotor indicates a movement swap or non-Mido service.
Sources: Mido official site.

You might also like

Omega Speedmaster Professional Ref. 310.30.42.50.01.002, black dial, steel case
Omega
Speedmaster
Ref. 310.30.42.50.01.002
Grand Seiko Snowflake SBGA211 Ref. SBGA211, white dial, titanium case
Grand Seiko
Heritage Spring Drive
Ref. SBGA211
Grand Seiko Shunbun SBGA413 Ref. SBGA413, rose dial, steel case
Grand Seiko
Heritage Spring Drive
Ref. SBGA413
Rolex Submariner Date Ref. 126610LN, black dial, steel case
Rolex
Submariner
Ref. 126610LN
IWC Pilot Mark XVIII Ref. IW327011, black dial, steel case
IWC
Pilot
Ref. IW327011
Omega Seamaster Diver 300M Ref. 210.30.42.20.01.001, black dial, steel case
Omega
Seamaster
Ref. 210.30.42.20.01.001

Buying guidance

← Back to Grail Atlas