Dagens Certina, sertifisert ~1968. Velkjent Certina kaliber 25-651.
Vintagecertnas.ch:
In 1916, for the first time, watches from the factory of the Kurth brothers were sent to Biel to the “Bureau Officiel de Contrôle de la Marche de Montres” and were successfully tested. But before 1960, fewer...