You are right, there was a pale blue example of a RK200 at last year's Retromobile, but I didn't read the display panel with the car. However, i am 100% certain this is a Rocoboy with an 'o', not an 'a' as that's the only name I've ever seen listed, including an old sales brochure for it that I have on my list since I was a kid, which is filed away somewhere. Here's another image, with the Rocaboy name, taken from a French article which may help for clarification. By the way, the correct year should be 1973 for this car.