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I had read an earlier post which I cannot locate that some responders offered the view that they suspected MNG stamps often were actually "used" stamps which had somehow escaped being cancelled.
That's certainly one way a stamp can become "mint no gum." To a great degree, it doesn't really matter whether the stamp escaped being cancelled, or had the unfortunate fate of becoming stuck to some kind of paper before being used, or was mint (unused) but hinged, or something else. In every case, two things are true: 1) the stamp wasn't cancelled (thus mint), and 2) the stamp no longer has gum (as a result of soaking).