also, he had boxes of PL dollars and sets starting from 1962.

i don't know, but it fits perfectly in the envelope.
it was addressed to my great uncle (not my great grandfather as i mistakenly said at first) who i inherited the collection from, so he is not around to ask....

quick pics, of what it is,

Hi, i have a set that my great grandfather bought from the mint that has the 4 varieties in a clear plastic case, in the original mailing envelope, post marked 1967, i looked around online but i don't see it so far,
were there many of these made ?
i can provide pics if that helps.