Reader Gianluca, who owns a VETTA that has the CX markings, gave me a tip that the framebuilder of the "CX" marked framesets was Antonio Taverna of Padova.
I have been in touch with Sig. Taverna and I asked if he was the framebuilder. He responded with, "Yes, these frames were made in 1982-1984 when the Cinelli framebuilding components were available to framebuilders."
Cinelli had previously verified that these were not Cinelli made frames.
Here are examples of CX framesets (click on images to enlarge):
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10 months ago