Certina Chronomètres à quartz

European Watch, Clock and Jewellery Fair 1981 BF 301
Quality, accuracy, reliability - the key words for Certina’s “quartz chronometers”. Each is individually tested and inspected for 13 days by an official body (COSE). Left and centre: two Marine-type designs in steel and goldplate; right: an extra-thin “Newport” model, in steel or two-toned. All are water-resistant and feature a scratch-resistant sapphire crystal. (CERTINA “Quartz Chronometers”)
(COSE z Contrôle officiel suisse des chronomètres Swiss Official
Chronometer Testing Authority)