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PLATE PROOF value 300h in black color, as miniature sheet, 4th stage, on chalky paper without gum; certificate Vrba and exp. by Karasek, very rare plate proof, only few examples exist! U:DR
PLATE PROOF 10h red and 20h olive, two marginal blocks-of-4, 5th stage, print from printing plate; decorative, on chalky paper without gum, exp. Vrba U:A5
PLATE PROOF in black color, 5th stage of printing, die proof, white value tablet, on chalky paper without gum, size 42,5x45mm; lightly hinged, luxury, certificate and exp. Vrba U:A5
PLATE PROOF in blue color, 5th stage of printing, die proof, white value tablet, on chalky paper without gum, size 44x45mm; lightly hinged, luxury, certificate and exp. Vrba U:A5
