6/15/2023 0 Comments Eterna matic serial numbersThe case has been cleaned by not polished to retain some of the patina of age. The watch has been serviced and regulated and it comes with a nos strap. The ball-bearing was so significant for Eterna that the image of five ball bearings was adopted as the company logo and can be seen on both the dial and the crown on this watch. The time keeping on this watch is still excellent for a vintage watch, pretty much still at chronometer standard.Įterna developed the first automatic movements that uses ball-bearings in the rotor (the off centre weight that winds the mainspring). In order to pass the test the movement can not have deviated by more than -4 and 6 seconds variation per day. The movement would have been tested over several days, at different temperatures and in different positions. The word chronometer on the dial means that the movement in this watch has passed the very stringent time keeping test applied by the Swiss observatory. The watch has date indication and the movement has a quickset date function - you pull the crown all the way out to advance the date. ![]() The cal 1466U movement has been fully serviced and is running excellently.
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