PC10a, blok van vier ongetande kleurproef 5ct flets grijsblauw plaat III positie 31-32 en 36-37 en PC11g, blok van vier ongetande kleurproef 10ct steenrood plaat V positie 31-32 en 36-37, beide blokken van dezelfde positie, breedgerand, ongebruikt zonder gom, luxe ex., zeer leuke combinatie, uiterst zeldzaam!! (6.000+++pt.)
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