I purchased two of the subject watches from Tuerler in Zurich. The first, in 1959, was numbered 743620 and stamped MEMOVOX on the back. It worked flawlessly for about 15 years. Then I had a routine service, also in Zurich. When it came back, the winding stem had great resistance and finally in 1978 it snapped and the watch was retired. The second, numbered 684434 (no other markings) was bought in about 1962 for my father. The first digit of the number, "6", was poorly stamped and I think it is a six. This watch also worked well and was retired after about 10 years when my father went electric. I have noticed some collector interest in these watches. The question now is: what level of investment in refurbishment is cost effective? What might a good working specimen be worth? A photo of the face of each of these is attached.
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