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.
The Challenge category at GPHG 2018 held 35 entries. These are the other 34.
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Both date discs must advance simultaneously at midnight; partial advance indicates the date mechanism needs service.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Big date simultaneous advance | Both date discs advance simultaneously at midnight; no lag between the two discs | One disc advances before the other; date mechanism needs service |
| caseback | Cal. 80 architecture | ETA C07.651 date-variant architecture through the caseback | Non-ETA architecture; movement swap |
| dial | Big date aperture clarity | Both date digits fully visible and legible through the aperture at 3 | Partially obscured date digits; aperture alignment issue |
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.