Looks like a cinderella (not a valid postage stamp) based on the US Kennedy Memorial Issue of 1964 (5c stamp). But to be honest, I didn't go through the Guyana listings because it looks too much like a cinderella. So take my reply with a grain of salt.
Welcome to the forum. A cinderella is something that looks like a postal stamp but is/was not used for postage. Doesn't mean it is fake. I know nothing about Guyana either.
Yes, it is Scott listed. As I stated before, I hadn't bothered to check through the full Guyana listings. Fortunately, Gaff pointed out the Scott catalog number. It almost looks like the supplier scanned the original US stamp, made some changes to the country/denomination, and then printed it out again as a stamp from Guyana!
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