Does This 1958 D Franklin Half Have An Error?

Hi everyone,

I was searching around the internet (and this forum) and was unable to find the answer to this. I just joined here hoping that you would be able to help. Thanks in advance for any insight you can provide.

I have had this 1958 D Franklin half dollar since I was a little kid and haven't seen anything like this on a coin. To me, it kind of looks like it was struck with too much pressure.



See how the edge of the coin continues out past the face? (Apologies for the shadowing, but I could not find a way to get a good angle without the edge blocking the light from one direction.)



It's the same thing with both sides of the coin.



Some of the wording appears to follow the curve up around the edges.



Comparison next to another Franklin half that I own.



Another comparison shot. See how the edge of this coin extends almost double the size? Also, it is completely smooth. No ridges whatsoever.

So the big questions from me are:

1) What could cause this? Is it something to do with the actual minting process? Could it just have got crushed somehow post-mint? (Seems pretty uniform around the edges though, and the middle of the coin shows no signs of strain from being crushed. It would have to be some type of machine that closed in evenly around the edge such that it didn't distort the shape of the coin.)

2) If this is actually a mint error, has anyone heard of others like this for Franklin halves? What do you even call this? I was unable to find anything online about it.

3) Is it worth any more/less than any other 1958 D that doesn't show these defect? Is it enough of a difference to submit it to PCGS or something?

Look forward to any responses here. Once again, thanks in advance for any help.

Cheers