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The perpetual calendar module and column-wheel chronograph share a single manually-wound base caliber; any indicator out of sync with the actual date is the fastest sign of a module that has drifted or been serviced incorrectly.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Day, date, month, moonphase, and leap-year synchronization | Day and month windows at 12 oclock, date hand and moonphase in the subdial at 6, day/night and leap-year indicators all correctly synchronized to the actual calendar date | Any indicator out of sync with the actual date, or a leap-year indicator that fails to advance on a genuine leap year |
| case | Column-wheel chronograph pusher action | Chronograph pushers engage with a light, precise click typical of column-wheel actuation; reset returns all counters cleanly to zero | Mushy or inconsistent pusher feel, or counters that fail to reset fully to zero, suggesting a cam-actuated substitute module |
| caseback | Cal. CH 29-535 PS Q through the display back | 456-part hand-wound movement showing a column wheel, horizontal clutch, and a Gyromax balance with Breguet overcoil hairspring | A different chronograph architecture (vertical clutch or cam-actuated) standing in for the column-wheel, horizontal-clutch caliber |
