Calibre LC1–AGP–01 features two balance wheels beating at 21,600vph with their rates averaged through a planetary differential. The differential divides power equally between the two oscillators while averaging their rates.

Both our hairsprings feature Breguet Overcoils or Phillips Terminal Curves to aid in concentric breathing. The balance wheels feature hairsprings pinned in 180° opposing directions to help overcome positional errors due to non-concentric breathing.

Both balance wheels are powered using side-angled lever escapements normally used exclusively in tourbillons and also in past Observatory Trial watches. They are used here to create a more compact architecture allowing us to create a 13-Lignes movement (29.33mm) capable of fitting in a 37.5mm in diameter watch.

This is the only timepiece in watchmaking history to use double side-angled lever escapements in this way.

The differential is located at the fourth wheel, much closer to the escapement, allowing it to average the rates of the two balances more directly than in most other differential-equipped watches.

It is a symmetrical planetary differential, meaning the averaging function is inherent to geometry of the differential, where neither fourth wheels serve as the planet carrier. Instead, they act on the planet gears symmetrically.

Calibre LC1–AGP–01 is developed in partnership with TEC Group Swiss, based in Switzerland.

Each Calibre LC1–AGP–01 is assembled and adjusted by hand. The two balance wheels are regulated to run at slightly different rates, allowing the differential to average them.

Every movement is individually tested before leaving Switzerland.