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Greece

postage

1980, May 5 Aristarchus 2300th issue wmk. crowns (no perf info)

-

20d

multi

Heliocentric system

Togo

1973, Jul 18 Copernicus 500th issue unwmk p. 14.25

X

10fr

multi

Heliocentric system

airmail

1973, Jul 18 Copernicus 500th issue

-

90f

multi

Heliocentric system

1 to 3 of 3