Stamps & Covers International Public Auction 371

1950 Currency Revaluation cover franked 'GROSZY' black opt type 3 Katowice & Krakow on 1946 Education M/Sheet on reg cover with 1951 6 Year Plan mining 90gr, tied by 'Sosnowiec 11 4 52' cds. To Denmark. SG MS571d(var) cat £1900. Mi Blk 9 cat €1500 - both for normal, should be at least double, with opt, & double again on cover so £7600 or €6000. Great rarity with only several examples of this M/Sheet with genuine opts recorded & probably unique on cover. 2019 Ceremuga AIEP photo cert. (P)
Estimate A$5000