It's what I feel when I look at these...
It seems that the designer of the Canon A-1 went mad at Canon when they decided not to go onto medium format. At some point, the designer went to Norita Kogaku, and designed the beauty on the right: The Norita-66 with the Noritar 80mmf/2, the fastest lens for the 6cm by 6cm (6x6) format. Norita made this only model of camera, but it manufactured a lot of lenses, ranging from Nikon mount to the lenses mounted in the North American Graflex cameras. When Graflex died, Norita also went the path, and left the photographic market leaving this great legacy. Pentax was aware, and it seems that they bought the designs and patents, and used them to build the Pentax 67 (and the Spotmatic, it seems). The fact is that, apart that they are for 6x6 and 6x7, they are very similar in design. They feel the same, and they are also almost of the same size and weight (the Noritar is lighter, though).
This is the camera velco is using recently with outstanding results!
Nikon D200 + Nikkor 50mmf/1.2 @ 1.2.