1933, 20k gray black ,red and yellow, seven mint stamps, including top sheet margin unfolded block of four and stamp with black instead of gray black background, both items are NH, full OG, F/VF

100.00

1933, trial printing of 20k in gray black, red and yellow, perforation 9 1/2, nice centering and intact perforation, full OG, LH, VF and scarce, Raritan Stamps guarantee, C.v. $4,000

1933, trial printing of 20k in gray black, red and yellow, perforation 9 1/2, a spot between second and third "C" in "CCCP" variety (position 106), fresh quality, full OG, previously hinged, VF and rare, N. Mandrovski certificate