It looks to me like it's a die crack. It could also be that some metal was pushed inward from the front of the nose to create the ridge. But wait for others to reply.
That's strike-doubling, believe it or not. Take a look at this, on my 1930-D cent. You can throw away the bromide, "flat and shelf-like," on these babies. There was more going on when these were struck than a twist or turn. These were violently shaken when they were struck. Keep it, you don't see much like these.
I think it is all damage as there is raised metal next to all the marks. Does not look like a die crack or a double strike of any kind that I have ever seen. Ever see a cashier crack open a roll of coins on the edge of the change drawer? I wish I could see these coins in hand.
I don't know, but mine is the same way, except the date is really mangled-up, too. Here are some more pictures. I love this coin. But these just show, strike damage can happen anywhere.
Could these coins have been damaged while being ejected from the die press? Slide Doubling can leave raised metal. http://www.error-ref.com/machine-doubling/
It's damage from the strike. I think that's right. The coin was doing more than just sitting still in the collar, minding its own business. But it's that moment when this occurred. That's to say, it's not die damage or PMD, but due to the strike.
