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On the rectangular gold case, six porthole openings each display acolored number: blue for the hours, which are read in the upper openings on the left and right; black for the minutes, in the lower openings on the left and right; and red for the date, which is displayed vertically in the center windows. The display relies on the instant jumping of all six indicators: a one-of-a-kind technical feat. A spectacular feature is the countdown of the final 4 seconds before the minute jumps.
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 Fran챌ois-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.