Czechoslovakia

Československo

21st August 1967

Issued in connection with a congress of the International Astronomical Union.

The stamp depicts telescope and dome of Ondřejov Observatory, and a spiral nebula.

Catalogue numbers:

Michel CS 1720
Stamp Number CS 1489
Yvert et Tellier CS 1583
Stanley Gibbons CS 1674
AFA number CS 1565
POFIS CS 1626

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