I wondered if you could help to tell me what's happened to a 10p coin I received as change this weekend - it looks like the rim has not been set properly. About a third of the edge the rim is ridged correctly but for the other two thirds the edge on the Queen's head side is blank and overhanging. The coin is dated 2016 and there are no marks on it to suggest it has been done by use or misuse. It appears to be an error in the minting of the coin. Is this a known error in the production of this coin? I've never seen one like it before. Apologies but I could not attach a photo due to size limitations.
