These coins are made of zinc, which is notoriously prone to all sorts of rot, cancer and corrosion. You can see a large pit above the T where a corrosion bubble has already burst. I'd be reluctant to classify the three blobs near the date as anything other than unbroken bubbles.
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