Occam's razor suggests that it is a refinished 13ZN dial. Atypical signature, sub-dials, hour markers, sunburst finish, condition, and silver feet all point towards this conclusion. On the other hand, the markings on the back of the dial are somewhat different than those found on the majority of original 13ZN dials that I have seen. Regardless, I do not think that it is original. And given the resemblance that your dial bears to this one, I am inclined to believe that they come from the same source.
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