Recently acquired another volume of the Archiv für Buchbinderei (Vols. 21-22, 1921-22). Another article by Ernst Collin, and 2 brief mentions/reviews of his Pressbengel. More about the Schablonenspritzpapier technique here and here.
Beautiful. I was looking for the tail end of that series you posted on air brushed end papers. Where can I find them? Xxxx