My first Certina!
Blue Ribbon model, 27 jewel Certina 25 - 65 automatic. Very clean.
From the Certina site about the Blue Ribbon model introduced 1961:
Thanks to its having produced the most resistant watch in the world, Certina is now also amongst the world's greatest names in watchmaking.Introduced to the public and other professionals at the MUBA, the Blue Ribbon watch and its extraordinarily flat automatic movement are big hits. Named after the coveted title for the record-setting transatlantic steamship crossings of the Queen Mary, the Normandie and the United States, the Blue Ribbon rides a wave of success.
Does anyone know if there is a table of Certina serial numbers anywhere on the web?