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.
Editorial estimate, 2026 Q2. Actual prices vary by condition, date, and box/papers status.
Movement tier: unclassified · caliber JLC Cal. 986: manual-wind tourbillon with Gyrolab balance wheel, 21,600bph, 50h PR; titanium Gyrolab balance replaces traditional circular balance to reduce aerodynamic drag by 25 percent; flying tourbillon · 50h power reserve (2.1 days)
Large case: suits wrists 7 in+ (18 cm+)
43 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.
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The Gyrolab titanium balance is a non-circular oscillator visible in the tourbillon; any irregular motion requires immediate JLC service.
Known issues in the market
The Gyrolab balance wheel is a unique "tuning fork" shaped titanium oscillator; any tourbillon with a circular balance is not the Gyrolab.
Gyrolab must oscillate freely within the tourbillon cage; any resistance requires 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
Stopped or stuttering tourbillon; visible damage to cage structure
Common legitimate replacements
The Gyrolab movement is unique to this reference and cannot be replaced with a standard tourbillon; any non-Gyrolab movement is a complete movement swap.
The Gyrolab replaces the traditional lever escapement and balance wheel with a gyroscopic regulating organ: two arms rotate in a circular path, replacing the oscillating balance. The Gyrolab mechanism is visible through the partially skeletonized dial and it is the sole authentication point that matters at the movement level. If the mechanism rotates continuously rather than oscillating, it is a Gyrolab.
Known reproduction risks
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HIGH RISK
Conventional balance wheel instead of Gyrolab
Visible regulating organ that oscillates back and forth rather than rotating continuously
Tick audible as discrete beats rather than a near-silent continuous hum
No "GYROLAB" text anywhere on dial or movement
The Gyrolab regulating organ is visible in normal use. Any watch representing itself as a Gyrolab where the visible regulator oscillates is not a Gyrolab.
Dial variants by era
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Era
Description
Identifiers
All current production
Partially skeletonized dial exposing the Gyrolab regulating organ in motion. The two rotating arms of the Gyrolab are visible at the center of the dial or in a sub-aperture, depending on the variant.
Gyrolab regulating organ visible through the dial: two arms (or a single fork-shaped regulator depending on variant generation) rotating continuously in a circular path, not oscillating
Rotation is smooth and continuous at approximately one revolution per 2-3 seconds -- not the discrete tick of a balance wheel
"GYROLAB" text on dial or movement bridges
Limited production character: this is a high-end limited complication
Exhibition caseback and partially open dial both showing movement architecture
Service part flags
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Gyrolab regulating organ
Original: The Gyrolab arms rotate around a central axis in a circular path. The rotation is driven by the gear train and regulated by aerodynamic drag on the arms. The mechanism operates continuously when the watch is running.
Replacement tells
Regulating organ that oscillates rather than rotates continuously -- indicates a conventional balance wheel has been substituted
Irregular rotation speed that varies visibly as the organ completes its path
Arms that are not symmetric or show asymmetric wear
Case back markings
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All Gyrolab production
Exhibition caseback with Gyrolab mechanism visible
"GYROLAB" engraved on movement or caseback
"JAEGER-LECOULTRE" and serial number
Cal. 176 or variant engraved on movement
Limited production number on caseback in limited edition variants
Movement tells
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The Gyrolab mechanism requires specialist service -- the aerodynamic regulator arms must be cleaned without disturbing the arm geometry or counterweight balance
Post-service, the rotation should be smooth and consistent; any wobble or irregular speed indicates incorrect reassembly of the Gyrolab organ
