There are three versions of ABC - ordinary print, slightly decorative print and constrained into a vertical diamond shape. The printed A.B.C. occurs on early (undivided) German cards. The examples are French, I don't know whether these are the same or different publishers. Although card 2653 was written in 1942, it looks ten or so years older.

ABC is a common element in logos, there are several post-WW2 topo marques - eg "A.B.C. Photographie Industrielle, Marseille", "Imprimerie ABC, 9 rue Blacas, Nice" and "ABC Verlag, Bern".

ABC 1010
ABC 2653 (or 2658)