The mint mark is above the letters DO of DOLLAR on the reverse, underneath the bow in the ribbon. It looks like both have mint marks but the photos are not good enough to make them out.
"I like money. I can't believe you like money, too. We should hang out." Frito
Better pics, now that you know where to find the mint mark would be good but looks like the 79 is an New Orleans (O) mm and the 21 looks to be the micro s for San Francisco.
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