On CoinsandCanada, there is a variety listed as a spike between I and Z of Elizabeth. While going through a roll of '67's, I found it in another spot in five coins, above the "E" in "CENT". The fifth is a little different but the first four look exact.
It does appear to be a similar spike as listed for the IZ area, and you have found it on more than one. Some sort of die crack. I see a spiked head is a die crack going from the rim to the head.
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