F.P. Journe Chronomètre À Résonance Ref. R Brass Platinum Salmon Dial

Journe was the first watchmaker to make resonance work in a wristwatch. Two independent movements sit close enough that their balances fall into step, each steadying the other, and the dial is split in two to show them. This is an early platinum example from the years when the movements were still brass, a period collectors track closely and prize above what followed. The idea goes back to Breguet and was never reduced to this scale before.

The platinum case is 38 mm, small by current standards and the size the model wore for years. The dial carries two independent twelve-hour displays side by side, each on whitened guilloché silver, set into a plate of rose gold. In practice it works as a dual-time watch, and it reads as perfectly symmetrical until the two times are set apart. The Chronomètre à Résonance has kept that layout since.