The Master Grande Tradition Gyrolab uses a bi-axial gyroscopic regulator in place of a traditional balance wheel; secondary prices reflect the movement's technical originality and JLC's position as the manufacture des manufactures.
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The Gyrolab titanium balance is a non-circular oscillator visible in the tourbillon; any irregular motion requires immediate JLC service.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Gyrolab titanium balance oscillation | Non-circular titanium balance oscillating freely in the tourbillon cage; tuning fork profile clearly visible at the 12-position | Circular balance wheel in the tourbillon; any irregular oscillation rhythm or stopped tourbillon |
| caseback | Cal. 986 manual-wind movement | Cal. 986 visible; manual-wind movement without rotor; complex bridge architecture consistent with JLC documentation | Any automatic rotor in a watch that should be manual-wind; caliber number inconsistent with 986 |
| case | Tourbillon cage condition at 12 | Tourbillon cage rotating freely at approximately one revolution per minute; cage structure complete with no missing components |
Editorial estimate. Actual prices vary by condition, date, and box/papers status. Live pricing data is in development.
| Stopped or stuttering tourbillon; visible damage to cage structure |
