We have 3 Hatz CB1 flying in France, all 3 with the Continental O-200 (100hp). The blue one is mine, the red and yellow one both built by Vincent Carret. Picture taken in 2020 … we managed to organize a last minute unexpected gathering as Vincent was landing not far from me on a cross country flight. 2 other unfinished Hatz in France : builders Philippe Caddeo and Jean Philippe Issanchoux..both with radial engines. But this is another story…From Michael Pallier, France