1933-S Walking Liberty Half - Squished S variety, ever heard of it?

I doubt it because I just made up that name.
I have a certified half here with a very interesting mint mark. Is this a well known variety? Does anybody know how it came to be?


0
Comments
You can check with Walkerguy21d because that is who I got the coin from....
thank you
John
Since it's certified I guess at least you can be sure it's not a poorly added S