Here are a pair of Topps Space Cards original artworks that Mastro offered in his June 2008 Classic Collector Auction.
Dating these is complicated. According to the Non-Sports Bible, the 1957 Topps Space Cards came out in 1957 with backs printed in black and blue tones, and their English version (U.K.) was printed in 1958 by A&BC. But there’s also a blue-colored back set issued in 1958 called “Target: Moon,” and Watson states that no one can say which was issued first, “Space” or “Target: Moon,” even though he dated the Space set to 1957. The salmon-colored backed cards were re-issued in 1967 as part of a game. However, in 2013, it seems like The Topps Archives settled on 1957 for Space Cards and 1958 for Target: Moon.
That said, it’s highly probable that just a single original artwork exists for each card. And for reference, a few others have sold for between $1,300 and $2,700. Also, “Testing A Space Pilot” is card #11, and “Robot Nears Moon” is card #8 in the 88-card set.
In case you’re curious, I found both sets’ penny and nickel wrappers on this Vintage Non-Sports Forum thread.
Happy collecting, and don’t forget to check out The Original Artwork Archive for more!