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1939 Alb.NV20Xx, 50h brown without watermark, horiz. grid in gum; superb, exp. by Synek + certificate Synek, c.v.. Synek 700€, rare stamp in perfect quality, ex. Pour U:A5
1939 PLATE PROOF values 20h, Alb.NV17, double impression, 1x in light green and 1x in/at definitive black-green color, on stamp paper with gum, on reverse full machine offset U:A5