Back to the watch again, note the "M" by the driving wheel. This indicates that the watch originally went to France. Here is another 13ZN with the same case design and "M" marking. As expected, "Fab. Suisse" is printed on the dial. I would expect to find it on the dial above too. However, just comparing the dial to original examples from the period should be more than sufficient to convince any discerning observer.
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