The old US issues are not expensive to buy too.
I received this week a card from the USA and there were two space stamps on it. One of them you can see at @si356z post, but I will put it once more as a picture here. 
The moon is really cool, because it’s in silver and when you move it, it “shines”.
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GREECE: Miniature sheet with a €2.50 stamp commemorating the founding of the (now defunct) Hellenic Space Agency (2018).
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USSR: The first Sputnik-1 launch commemorative stamp of the Soviet Union, issued using a text overprint on a Konstantin Tsiolkovsky stamp, Scott #2021, October 4, 1957.
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Hello, you are sending such a beautiful collectibles, would you send me a link to some online store? 
I believe, more of us would be interested 
ISSUE NO 10
This time, the main topic I astronomy. The"year of the quiet sun ". You can read more about this topic here:
I don’t think, that the czechoslovakian post was referring to the movie from the same year, that was not quiet at all 
Stamps and FDC
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I almost forgot the Voschod stamp. The flight of the Voschod 1 was very risky business, but the brave trio was very lucky and survived 
Unfortunately I don’t have the FDC. If anybody has, don’t hesitate to share with us
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USA: postage stamp of 3¢ commemorating the Palomar Mountain Observatory (1948).
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I think you can search them in AliExpress.
ISSUE NO 11
15.3.1965
Another space stamp set issued by czechoslovakian post. We were really keen on astronautics in the past
And the FDC’s
Artists : Lukavský, Herčík, Housa, Mráček
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NB！
Very nice!🫡
Another Czechoslovakian issue of 1965 was dedicated to flights with two astronauts onboard. The Voschod 2 and the Gemini 3
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The next issue is dedicated to interplanetary exploration. I really like the amount of detail put into the painting considering how small these stamps are.
1966
FDC’s
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