F.P. Journe: Two balances define the Chronomètre à Résonance

The calibre 1520 generation of the Chronomètre à Résonance arranges two time displays around a central differential. The winding crown sits at two, and a second crown at four resets both seconds displays. The exposed central mechanism gives the otherwise classical dial a clear visual explanation of its unusual construction.

One barrel supplies two independent gear trains, each with its own one-second remontoir. F.P. Journe describes a 28-hour constant-force operating period within the movement’s 42-hour total autonomy. Two balances are adjusted to operate in resonance. Platinum or 18K 6N gold cases are offered in 40 or 42mm diameters, at 10.8mm thick.