Pre-owned watches trade across a wide condition spectrum. These ranges are typical for the secondary market.
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.
The annual calendar day, date, and month apertures must all advance correctly; a lagging month disc is the most common service indicator.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Annual calendar aperture advancement | Day, date, and month apertures all advance cleanly at midnight; month disc advances correctly through 30 and 31-day months automatically | Month disc that does not advance at month-end; any aperture that lags or advances at the wrong time |
| dial | Text printing in apertures | Day, date, and month text is correctly formatted and centered in each aperture; font matches GP specification | Misaligned text in any aperture; incorrect font or size; text that is not fully visible when centered |
| movement | Cal. GP033R0 via caseback | Exhibition caseback showing GP in-house annual calendar movement with correct caliber designation |
The 1966 Annual Calendar is the complication flagship of the 1966 round case family. Cal. GP033R0 advances the calendar automatically at month-end, requiring just one correction at the end of February each year. Testing the calendar correction is the most direct functional check.
Stable over the past 90 days
Based on eBay sales, last 12 months
| Non-GP movement; standard date-only movement substituted for annual calendar caliber |
| Clean round dial with three calendar windows or apertures for day, date, and month. The GP annual calendar mechanism displays all three simultaneously without requiring manual correction except at February/March transition. |
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