The disc bearing two moons is driven by a 59-toothed wheel corresponding to two lunar cycles (2 x 29.5 days). The latter thus reveals its successive phases – and faces – throughout its cycle (waxing moon, full moon, waning moon, new moon). Merging into the hour subdial at 6 o’clock, the moonphase depicts the revolutions of the night star through a special-shaped aperture with two rounded cut-outs reproducing the dark part of the moon. The days and months are counted off at 10 and 2 o'clock respectively, while the date remains imperturbably enthroned between 4 and 5 o’clock. Introduced this year with a silver-toned dial, it reproduces the original function layout in a distinctively 1970s spirit. Built around a column wheel and endowed with a 50-hour power reserve, like all the El Primero movements that would punctuate the Zenith collections, Calibre 410 made its way through the decades until the year 2000 thanks to remarkable reliability coupled with extraordinary precision.Īlmost half a century after its creation, El Primero Calibre 410 has evolved in various ways, including having a complete model named after it and finding its way back into the legendary El Primero collection. The name of this movement also born in 1969 was the El Primero 3019 PHF, later referenced as 410. That same year, buoyed by the daring that has guided its steps since its founding in 1865, as confirmed by the over 300 patents registered to date, the Manufacture Zenith further rolled back the boundaries of its art by equipping its calibre – that had become an instant watch industry icon – with triple calendar and moonphase indications. It was already an impressive feat in itself, backed by exceptional precision since the calibre beat at the exceptional speed of 36,000 vibrations an hour, corresponding to 1/10th of a second precision. After seven years of research, the Manufacture presented El Primero, the first ever integrated automatic chronograph, also equipped with a date and a tachometric scale.
While one man took a small step that proved a giant leap for mankind by walking on the moon, Zenith did much the same for watchmaking that same year.
Steadily perpetuated over the years, it now appears in a form bridging past and present, orchestrated around a display loyal to the historical model, while the case displays resolutely contemporary lines. Created in 1969 as a variation of the legendary El Primero, it combines the performances of the world’s most accurate automatic chronograph with triple calendar and moonphase indications. A movement well-known to collectors beats at the heart of the latest Zenith watch: Calibre 410.
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