The copy whose millimetres are the edition's axis: the one it names, or where it names none or one it no longer has, the first copy with features that is not aligned, which is how an edition stood before it named one.
The copy whose millimetres are the edition's axis: the one it names, or where it names none or one it no longer has, the first copy with features that is not aligned, which is how an edition stood before it named one.