We met No. 31 at an event in Haisnes, North of France. We were told the owner of this one has another two! (No. 102 en No. 404, if we understood well).
In the end there were two Birotors and 3 M35's at the meeting. Because of the weather several owners of an M35 had left their car at home, but they were there; we counted 8 of them!