The Opus 1 series consisted of three limited editions of six pieces each, all unique. All featured exceptional movements made by F.P. Journe.The first model, the Opus One 5 Day Automatic featured a F.P. Journe 5 day automatic chronometer movement with free-sprung balance, four adjusting weights, in-line lever escapement and 15-tooth escape-wheel. The second model, the Opus One Resonance Chronometer (as pictured here) had two time zones and used a altered version of Fran├зois-Paul JourneтАЩs resonance chronometer.Last but not least was the Opus One Tourbillon with Journe’s one-minute tourbillon movement with constant-force remontoir.
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