Extremely rare and mint Zenith G581 El Primero automatic Chronograph, 18kt yellow gold. Case measures 37mm. excluding crown, back signed and hallmarked, as the crown. Only 250 pieces made in the 60s. Awesome silver dial with Charcoal Grey/Black sub dials and tachymetre, gold baton markers, date at 5. Powered by the Zenith automatic movement 3019 PHC calibre 31 jewel. The watch is in overall excellent condition and works properly.