Grail Watch Reference

A Reference Library for Watches from Grail Watch

  • Movement Database
  • Grail Watch Blog
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    • 1979 Citizen Movement Table
    • Seiko Blue Book Automatic Movement Chronology
    • Seiko Laurel Brochure
    • Seiko List of Basic and Derivative Calibres
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Introduced in 1949, the Gyromax balance is most closely associated with Patek Philippe. It is a balance wheel with eight eccentric masses arranged on the top of the hub. These can be turned to adjust the mass at any point, with two pairs capable of +/- 50 seconds per day and one pair for +/- 15 seconds.

Patek Philippe later adjusted the design in Cal. 324 to have four arms instead of two and four masses instead of eight. The new version has one pair for +/- 30 seconds per day and the other for +/- 11 seconds. The weights are also moved inward from the rim to reduce aerodynamic drag.


AP 2120

AP 2121

AP 2923

BVL 268