You would need to look at the position of the aperture ring and other details and compare with the ZIV originals. As i mentioned, no new Zeiss construction seems to exist. Assembly from existing parts of old constructions would need to have the various elements in the same position. I strongly recommend contacting someone more knowledgable about ZIV. In the meantime a wording like "The Zeiss label on this lens is interesting. It does not necessarily signify that the optics were produced or licenced by Zeiss, but does lead to a higher price."
Improvements, bugs, etc.
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