The first American edition of Modern Painting has the letters ABCDEF on page 240. Published in 1970 by Golden Press, New York, N.Y. © Copyright 1969 by Editions des Deux Coqs d'Or, Paris, and Mondadori-OGAM, Verona. Printed in Italy. Cover price is $1.95. The number on the spine is 42303. Listed as a Golden Art Guide.
There is a French version of Painting titled Peinture Moderne. The contents are identical to the American version. This precedes the American version by one year. © by Editions des Deux Coqs d'Or, 1969. No image available. I'm still trying to locate a copy.
No revised edition or cover variant exists that I am aware of. Out of print.