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I have a US "Stop Drug Abuse" stamp from 1968 or thereabouts and I can imagine some 'clever' stoner using it for sales.
Circling back to this, I highly doubt actual stamps were impregnated with LSD and then sold. However, I wouldn't be too surprised if LSD blotter paper were made to look like a stamp of one kind or another and sold that way. They are usually made with a design of some sort, usually something psychedelic, but more mundane designs are sometimes used as well.