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Zenith. A very rare stainless steel automatic tonneau-shaped full calendar chronograph prototype wristwatch with moon phases and bracelet
Zenith. A very rare stainless steel automatic tonneau-shaped full calendar chronograph prototype wristwatch with moon phases and bracelet

SIGNED ZENITH, CHRONOGRAPH AUTOMATIC, EL PRIMERO, CASE NO. SP1205, MANUFACTURED IN 1970

Details
Zenith. A very rare stainless steel automatic tonneau-shaped full calendar chronograph prototype wristwatch with moon phases and bracelet
Signed Zenith, Chronograph Automatic, El Primero, case no. SP1205, manufactured in 1970
Cal. 3019 PHC automatic movement, 31 jewels, light grey dial, applied luminous baton and star numerals, luminous hands, Arabic five minute divisions, outer silvered ring for tachymetre scale, three silvered engine-turned subsidiary dials for constant seconds, 30 minutes, 12 hours register and moon phases, windows for day, month and date, tonneau-shaped water-resistant type case, screw back, two round chronograph buttons in the band, stainless steel Zenith link bracelet and deployant clasp stamped "GF" for Gay Frères and 3.69, case, dial and movement signed
38 mm. length

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Lot Essay

The present "El Primero" is a most attractive prototype from 1970. Scholarship stipulates that only 25 such watches were ever made. Visually they can be recognised by the distinct star-shaped hour markers, positioned at 2 and 10 o'clock. Still retaining its factory case finish and the original Gay Frères steel bracelet, it is not only a great addition to any Zenith or chronograph collection but also a fantastic watch to wear.

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