Yo dawg, I herd you like stamps, so I put some stamps into your stamps, so you can get more stamps while you collect stamps.

Hungarian FDC, 1963.

A világűr hősei, FDC, 1962.X.27.

The Heroes Of Space, Hungarian FDC, 27.10.1962.

Csoportos űrrepülés, 1962. VIII. 11-15. Budapest, első nap, 1962.IX.4.

Vostok 3 and Vostok 4 joint spaceflight, Hungarian FDC, 1962.

Vostok 4 (with cosmonaut Pavel Popovich on board) was launched a day after Vostok 3 (with cosmonaut Andrian Nikolayev aboard) — the first time that more than one manned spacecraft were in orbit at the same time. The two Vostok capsules came within 6.5 km (4.0 mi) of one another and ship-to-ship radio contact was established.

Yuri Gagarin, Hungarian stamp, c1962. Artwork: László Kékesi.
Köszi Klág!

Yuri Gagarin, Hungarian stamp, c1962. Artwork: László Kékesi.

Köszi Klág!

Fabrique de timbres-poste boulevard Brune : séchage, gommage et sortie des feuilles, Paris, 1913. Agence Meurisse.
Stamp factory, drying, peeling and output sheets. Paris, 1913.
via BNF

Fabrique de timbres-poste boulevard Brune : séchage, gommage et sortie des feuilles, Paris, 1913. Agence Meurisse.

Stamp factory, drying, peeling and output sheets. Paris, 1913.

via BNF

Pavel Belyayev and Alexey Leonov (Voskhod 2), Hungarian FDC, signed by the two cosmonauts. Apr 17, 1965.

Skylab EVA, Hungarian stamp, 1977.
These Stamps Hail The Skylab Missions In 13 Awesome Ways
In Memoriam Challenger, 1986. január 28.
In Memoriam Challenger. Hungarian block of stamp, FDC.

In Memoriam Challenger, 1986. január 28.

In Memoriam Challenger. Hungarian block of stamp, FDC.

Halley, 1986. 

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ASTP, 1975. Soviet stamp block.

ASTP, 1975. Soviet stamp block.