@mad, first welcome to CCF. Second, you have what is called a " Magician's coin", where someone has hollowed out one nickel and then removed the rim from a second one and then joined the two halves together. Although your picture is a bit fuzzy, it looks to me like the seam is at the rim on the 1971-dated side. These are not mint errors but are a fun find.
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
agreed, you can see the seem on the 197? side. but I think it is a 77 with the top of the 7 cut off to fit. the '1' would be at a very odd angle if it were a '1'
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