Quote:
If I hinged the selvage of a MNH stamp, would the stamp be still considered MNH?
If a tree falls in the forest?

It doesn't appear that anyone answered, so ...
The short answer: Yes, the stamp is still MNH.
However, in the case of plate blocks, gummed souvenir sheets with detachable stamps (EG - US, Scott #630 White Plains SS), booklet panes, or anything that is valued with selvage, the NH premium no longer exists.
Even more confusing would be souvenir sheets without gum, but with gum on the stamp(s). Even though the sheet is without gum, and the stamp is flawless, a hinge on the ungummed portion of the sheet disqualifies it from being MNH (EG - DDR 1949 "Goethe" SS).
How's that for muddying the waters?

Brian