Our Zenith expert - Hartmut - will probably be along later today. But it would be very useful if you could open the back of the watch and take a sharp picture of the movement - if you think that you can do that without causing any damage.
It's quite an odd piece. The dial is very much the same style as the larger pocket and smaller pendant watches of that time - enamel, black hour and blue (some have red) minute numbers. The case is hinged so everything points to a pendant watch conversion. On the other hand, the admittedly blurred pictures suggest that it has a wrist watch calibre, either the Cal. 12-4 or the Cal 106 or 126. What numbers are under the balance wheel?
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