Interesting, but these shots are not so very rare! In fact they were published many times!
The Pa.22 was not the first Payen delta. An earlier design was the Pa.100 fitted with a radial engine.
It was intended as a racer in the Coupe Deutsch de la Meurthe, but it was not very successfull!
After the war, Payen built a last small delta plane as the Payen Kathy, which is now on display in the Musée de l' Air at Le Bourget.
This shot of the PA.100 is much less known!