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They are the first undated British coins to enter circulation for more than 340 years.
The Royal Mint said the issue had been resolved but wanted to reassure the public that the faulty 20p coins were still legal tender.
The coins without a date were created by accidentally pairing up the new 'tails' side with the old 'heads' - meaning no date appeared at all.
A Royal Mint spokesperson said: "The Royal Mint can confirm that a small number of new design 20 pence coins have been incorrectly struck using the obverse from the previous design, resulting in these coins having no date.
I am only offering collection only / delivery to ensure that both parties are satisfied with the transaction (I am willing to travel anywhere in the UK).
These coins have no date whatsoever, I have had them checked at the bank and they are 100% genuine mint error coins.
A 'mule' is a coin that has mismatched sides - a reference to the mule
01590
Postage and packaging
Dispatches to: Will arrange for local pickup only (no posting).
 
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