Wonder why the op indicates these are overprints on the front of the stamps, as has not shown back scans (which would show tape marks if that's the reason)?
Ex-tape marks might not be as visible on the reverse of the stamps if they are mint with gum, which it appears these are.....used or MNG will normally be very visible on the reverse but it is not always so, at least in my experience with gummed stamps....
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