Trailer markings

[Maurice Donckers]

thanks for the info , I also couldn`t find the number 215 in anny lists , a bit lower is the Signals collor again with number 74 in red on it(on the first coat of paint ) , and also on the white axle plate is still number 74.
on the other side is hardly visible a black square with remains of a white circle on it (XXX corps ? maybe)