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postage

1951, Apr 25 1st Polish Science Congress issue unwmk p. 9-14.5 (6 stamps)

X	25g	rosecar	Stanislaw Staszic
-	40g	ultra	Marie Sklodowska Curie
X	45g	pur	ZFvon Wroblewski nand KSOlszewski	—	—
-	60g	grn	Marceli Nencki
X	1.15z	cl	Mikolaj Kopernik 1473-1543
-	1.20z	gray	congress emblem

1951, Apr 25 Labor Day 1951 issue

-

45g

scar

Worker & flag

1 to 7 of 7