I was thinking about the "inverts" and the
fact that they are called errors. There may have been a no
kidding 25 cent inverted center stamp that started this mess. (Sanabria 101a / Von Saleski PE-C500) I believe (but
have no hard evidence) that Sanabria induced Peckmore to print
the 50 cent (Sanabria 102a / Von Saleski PE-C501) with an inverted vignette conveniently inserted in
the frame correctly so he could market the air mail "inverts". Face it, the 50cent with a true printing error would not be real pretty. I don't think this would be an error. I also think this opened the flood gates and suddenly we had complete sets of them printed. Von Saleski only lists the 3 and 4 cent as "inverts" but all the bicolor stamps exist. So the point is, are the invert errors commonly found really errors?? I don't think so. I would love some input from other collectors on this.
Please note: I am not a Liberia Collector per se. I collect the ABNCo printed issues, the 1949 "Love of liberty" and the 1952 Ashmuns of course.