I have two 74 Eisenhower dollar coins both have a corkscrew like imprint. One has the mark in front and above the eye and the other has the mark behind the eye. I have not come across this type of mark. I would appreciate comments as to this being unique or common and what the cause could be for the similar marks on different coins. Thank you.
Yes, distinctive hits caused by reeded edge of other large coins(s). Coins are jostled quite a bit as the go about their lives. Just watching videos of coins being dumped into large bags at the mint can be disturbing.