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Hi Justin --
These are called "first day covers" and are issued on the first day of stamp distribution. The medal is a bonus; they are fancied, pretty much, by stamp collectors, not coin collectors. Your 1974 FDC sells for $3 to $8 US dollars.
Here's one that sold on eBay:
https://www.ebay.com/itm/133961237544?hash=item1f30b64428:g:PFMAAOSwebNhrqbw