|Diameter: ||38.00 mm|
|Indexes: ||Arabic Numerals|
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 François-Paul Journe’s resonance chronometer.
Last but not least was the Opus One Tourbillon with Journe's one-minute tourbillon movement with constant-force remontoir.