Three trial colour proof panes of eight, each in black on large size sheets of soft white-unsurfaced wove paper. The panes display the trial progression of the side inscriptions: Pane 1) top right "-PAL-" thin lettering, lower left "-PAL-" thicker lettering with small series "4" numbers; Pane 2) both -PAL- thin lettering with larger series "4" numbers; Pane 3) both "-PAL-" and series "4" numbers have thick lettering as issued. Each sheet folded two or three times touching a few proofs, peripheral faults can be trimmed off. A remarkable lot, Fine (Unitrade CL43P variety; cat. $21,600 for standard proofs in black on white card) (Image)

Estimate 4000 $

Series "20" imperforate proof pane of eight, printed in dark green on yellow gummed paper - no airplane. Trivial printer's ink smear in top right margin, a beautiful proof pane with full original gum, VF NH (Unitrade CL43Piv; cat. $12,600) (Image)

Estimate 3500 $

A similar lot, trivial printer's ink smear near edge of lower margin, VF NH (Image)

Estimate 3500 $