It looks like PMD. Because of the way the edge looks to be shaped, I would normally suggest that it had been "spooned", but in this case, with the unusual loss of detail on the obverse and reverse devices, I'm leaning toward this being a dryer coin. Chris
Oftentimes you will see a coin with the edge flattened as in your photo. This is accomplished by continually hitting the edge with the bottom of a spoon. Chris
Look at the 2nd, 4th & 6th photos on the first line. http://www.bing.com/images/search?q=spooned coin&qpvt=spooned coin&qpvt=spooned coin&FORM=IGRE
Hi BonnieSue.. You mean the 1953 Half Dollar. Either the person who posted the picture thinks it's an error. Or the website showing the spooned coin is giving an example of errors vs non-errors.
If I haven't told you before.. you take great pictures! And thanks for showing us both side of the coin!
My Phone is my best friend Samsung SG4, and thank you for noticing, and there is always 2 sides to a story..