They are cinderellas from the 1937 Amoco souvenir booklet. This was back in pre-BP days when they were still known as the American Oil Company. Yeah, gas stations used to make this kind of stuff for customers; back when gas was a few cents per gallon...
The complete set has 32 stamps printed in 4 colors.
Here's one of them shown previously on SCF:
https://goscf.com/t/6394They also made one with the US presidents (in regular issue size).
BTW, welcome to Stamp Community Family, Diesel5709!
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