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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.

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Managed to get some form of photo uploaded...

10p.png

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This is an example of a fairly common mint mis-strike: the blank from which the coin is struck has not fully settled into the collar that locates it between the dies (and which being grooved, also imparts the milling to the edge as the coin is squeezed between the dies). As such the bit of the blank that protrudes not only misses out on the milling, but can also "overflow" wider than the rest of the coin when pressure is applied with no collar to retain it, which sounds exactly like your description in the original post.

An interesting curiosity, but of no real value, I'm afraid, but hope it helps answer your question.

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Thanks for your reply!  I'm definitely keeping it as like you say it's interesting and I've never seen it before.  Thanks again - much appreciated.

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