I have just gone through 2 boxes of half dollar coins and I found a LOT of Kennedy half dollar coins that have a raised ridge around Kennedy 's head. I have also many that same/similar raised ridge is on the reverse. This is 100% *NOT" what many coins have scraped into them from coin rolling machines. This is definitely from the moment of the coins being stamped out. I can't find anything online so I figured I'd ask it here.....What is it/are they? ...and What caused it/them? Thank you PS. Apologies for the bad pictures but even though my phone SHOULD take AWESOME pictures it CLEARLY (Is that a 'pun'?) doesn't .