Eterna matic 3000 watch serial number 5066703 around 1960s - Watches question. When you have got the serial number then look it up in our Longines serial number matrix. Eterna began using the ball-bearing auto in the late 40s. Eterna movements, you begin to see that any technological improvement eterna created would find its way into an ETA movement several years later. They set laws to govern who could make what. Longines serial numbers by year To put a date of production on your vintag Longines watch you have to locate the serial number which most often is found on the in- & out-site of the back case. Fans of this model included Gina Lollobrigida and Brigitte Bardot. Thank you for the welcome and for your observations regarding my Dad's watch. The real mystery is how they got away with it. That year, they presented the Eterna-Matic Dato, which was the world's flattest automatic watch with a date display at the time. Jon is correct, ETA was spun off of eterna in the 30s. It seems that eterna developed the technology, used it in their movements, and then ETA got it a bit later. I think it could use a cleaning on the inside, but seems in very good condition for it's age. Eternamatic was the in-house automatic movement for eterna. The watch works well, and winds automatically.
