Just thought I'd add another batch of Cuevas photos to this discussion. The Cuevas pictured here was likely built in '78, and was a custom build for a woman, according to the info I got from Mr. Pinto, which is where I found the bike. Interesting approach to building a small frame with 700c wheels. This bike was for sale, and I posted it to the CR list about a year ago. I say "was" because while my granddaughter was working for me at MPI over the summer, she took a fancy to the bike, and it actually fits her really well since she has short legs and a long torso. She plans on coming back and working again next summer, so I'll set it up for her to ride then.
http://www.wooljersey.com/
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Wayne Bingham
Lovettsville, Virginia USA