Post mint damage in my opinion. I would think that the coin was encased in something at some earlier time.
yes they are only visible on the front and back on the rim only. the side looks normal. it caught my eye so i figured i would ask
it really does not look like damage but a design. would someone really encase a coin with a date looking like that? how would it have been held in place. inquiring mind always looking to learn
People encase coins for a lot of reasons, regardless of condition or date. Sometimes they are in something like a "lucky penny" holder, where the coin is encased in plastic. I highly doubt that it is mint made, as there is no logical explanation for how it could be made inside the mint.
Looks like it was within a bezel... Possibly part of a jewelry piece for someone born in the year 1966?