Always been meaning to sit down and start going through all of my Canada stamps and start looking for re-entries and such. First page I found these 2 interesting ones. Nothing listed on either in Unitrade or the re-entry site so not sure if they are constant.
Unitrade 116. Thought just a poor wiping job at first but the letters in "Canada" made me look twice.

And this ˝˘ Leaf Queen with what looks like a little stroke on the end of the E in Postage.

