Probably Franken, but it seems that Zenith put together some strange divers in short production runs in the early to mid 70's. I haven't seen this configuration before, but the presence of a 2572PC places it in a time frame that I associate with some weird dive watches. I've seen at least one other Defy diver from that period with hour markers like these, which seem out of place on a deep diver because they appear to be free of lume. So yes, I agree it is unique and probably Franken, but I'm not 100% sure it's fake because of the high degree of variation among Zenith divers in that period. If there were a "stellina" on the dial and a 2552PC inside, I would say definite Franken.
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