27L - postfrisse 50 cent geelbruin Koning Willem III 1872 met deel van ondervelrand, keurstempeltje Nd. Bd., cert. Koopman 1983 en attest Vleeming 2015 (op gom 2 horizontale gelige kleurstreepjes ov. fris zegel zonder gebreken), zeldzaam in deze kwaliteit, catw. € 5000
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