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Interesting both of us (khj) saw different things.
Mike, I mentioned the gap, because that test applies to the other stamp designs of those sets.
It is good that you mentioned the specifics of the design difference for that particular stamp, because occasionally, we run into no-tab stamps that are poorly perforated so that you cannot see the bottom of the stamp. Then, you have to rely on the main design differences to distinguish between the different issues.

k