I like whizz-bang booklet fold-overs as they can produce some wonderful examples and include what is not normally seen from the original printing sheet. The "most common" valuable examples include one or more imperforate between pairs which are rare and expensive catalog listed errors.
However, I admit I am partial to the full plate number on the 15 coil, as only that row of coils when miscut will have the plate number below capture. When fully captured, they can be striking.
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