Wasn't really looking for an error slab, but since I saw this one just listed as a relatively low grade 1970 S I picked it up for $11. Just an oddity to add to the collection.
Lol. I've seen quite a few like this. Usually it's either the date wrong (71 instead of 77) or the wrong MM (S instead of O). I've never seen them put a MM on a coin that doesn't have one.
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