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36. Blind perforations: These are perforations that have been punched but not punched out. At first glance, the stamp appears at least partially imperforate. This is common on some issues, not so common on others. In either case, value tends to be minimal. Blind perforations can sometimes be found as a lead into or out of an imperforate section of a pane where the perforator was fully disengaged. Such a piece is called a "transition piece."
Type 36: This example of Scott 1608 has blind vertical perforations. They can be seen more clearly if you look at the enlargement by clicking on the picture.
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