1911, a lot of four rarely offered unwatermarked proof prints "Luitpold" in different colors as a block of four miniature sheets (format approximately 145 x 120 mm) on ungummed paper (as manufactured) in various colors (all with WZ. 4). Including the rare 80 Pf (Michel number 85 II, corner crease) and three times the 1 M (no. 86 I). One on white paper (brown spot in the margin, but without creases), and two on other paper colors (once with diagonal creases and once flawless).