Since everyone is doing so well with the British 1953 color question in the other thread, here's one with even less evidence to go on:
The brochure from the Mexico pavilion at the 1964/65 New York World's Fair mentioned development of an original color TV process in Mexico. I haven't been able to locate anything about this. I have a very vague recollection of a proposal for a two-color process way back when (but I don't think it was Baird's proposal). On the other hand, my recollection could be (probably is?)totally false.
Here's a scan of the brochure page.
Bythe way, the official fair guide book (1965 version) said that the Mexico pavilion was showing tourist attractions on closed circuit color TV. My surmise is that they had an RCA set somewhere in the building and RCA occasionally put travelogs on the closed circuit network. I've raise this question with the NYWF enthusiasts at
www.peacethroughunderstanding.org.