I was sorting through a bunch of British Commonwealth to list on HipStamp when I came across this overprint freak on Barbuda's 1977 Royal Visit Souvenir Sheet, Scott 317. My browser won't let me upload the image of the entire S/S as its too large for the system to allow (and I'm in no mood to add a browser), but the enlargement of the area in question is small enough to make it, so it appears below.
Its kinda nifty, so I thought I'd share it here. Note how the 2nd 'B' in the 'Barbuda' overprint is missing its upper curve/arc. Clearly, some foreign body got in the way causing the misprint. But this time, the culprit is also present! Check out the left arm of the 'U' in the overprint. The chad that had gotten in the way of the 'B' is adhered to the 'U.'