I just picked up this Viasa brochure from Egypt via eBay (along with some other 1 sheet brochures). Note that these rigs are all powered by the Perkins Diesel. I’ve dated this using the legal notice at the bottom of page three that ends in “1969”.
This front page is about 8.5″ x 11″ landscape oriented:
This middle section opens horizontally:
This is the back page:
looks like a “B” mid picture for good measure?
Looks like the VIASA CJ-6. See here: https://cj3b.info/World/SpainHistory.html