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Yes, definitely. The earliest serial I've seen for a 10357 1 is 1844268, and yours is not far after it.
The earliest production examples (1956-7) had only "Microtor" on the dial and "patented rights pending" stamped on the movement plate around the rotor.
This was whilst they were producing Microtor mechanisms and had applied for the Swiss Patent to protect it, but were waiting for it to be granted (hence they didn't have a patent number yet). It was granted officially as Patent nr. 329805 on 15th May 1958.
https://universalgenevepolerouter.com/patents/patent-329805-swiss/
Some time around here they switched to "Automatic Microtor" on the dial, and not long after, the 215 movement plates with patented rights pending were replaced with ones stating the swiss patent number instead.
(There is a crossover with the movements, I guess they had an excess of patented rights pending movement plates to use up before switching to the new ones..?)
The same pattern above applies to 20357 (steel version of yours) and 20360 (big case version).
Thanks! I've always wondered why my dial only said 'microtor'.
Another thing I found curious, I've owned two microtor UG's and both display poor rotor winding on my wrist. On an automatic winder they show plenty of power reserve.
Not sure about that one... some rotors can be a bit "sticky" i've noticed, it might be something to do with the bearing/post that a watchmaker can help with.
wow @rustynuts that's a helluva bump man. I don't think you have enough yet 馃槈
Also yours is the only gold electric I've ever seen. Very cool.
Sorry to be blathering about this one in multiple threads today - can't help myself! 馃榾馃槜
For posterity, Universal Geneve Tri-Compax Reference 12253, 18k gold, from the mid/late 1940s.
Love your watch but in the Polerouter Gallery?