Invented by Breguet  Resonance uses two separate movements. Each movement corrects the other to enhance precision by using a resonance effect. Resonance watches are extremely rare however Watchmaker François-Paul Journe built one based on the Breguet process in 1998.

The process involves the two balances being pushed away from or brought closer to the other using the pinion bridge to obtain a precise watch correction.

Repeater WatchRetrograde