I'd vote PMD; they look like mount marks to me. As to cause, I would guess that someone long ago turned that 2 cent coin into a button. Then someone else some time later decided to break the button apart and "salvage" the 2 cent coin.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis

























