This seems to be from a plugged die. Erro-ref.com lists this under "Struck through grease." As you have discovered, saying you have a number of them, it is not all that uncommon.
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And is there a market for coins like this
Generally stuff like this is hyped up on
ebay as being a rare error by people trying to sucker others out of their money, or, to be fair, some people just don't know any better. A lot of people nowadays have been led into thinking anything odd in a coin means the coin has to be a collectable.
How much squash could a Sasquatch squash if a Sasquatch would squash squash?
Download and read: Grading the graders
Costly
TPG ineptitude and No FG
Kennedy halveshttps://ln5.sync.com/dl/7ca91bdd0/w...i3b-rbj9fir2