I found this little "beauty" searching through pocket change, my pocket, not someone else's. It looks like this was struck through just about everything they could find. I call this one my Frankenstein Dime.
What you have there is a case of die deterioration. Also called "orange peel" I believe. http://www.error-ref.com/orange-peel-texture/
They sure do get their money worth out of dime dies. 2016 and 17 dimes everyone I got in change had die cracks, orange peel, die chips... I venture to say a MS 69 are few and far between.
Thanks guys. I like to think I learn something new here regularly with info like this. I also have some 15's and 16's that look worse than this.