Mule Die Clash.
slabMint Error News Magazine reports the discovery of the unique mule die clash discovery coin certified by PCGS. It was discovered in change and sent to PCGS for authentication and grading. It is a 1999 Lincoln Cent, graded MS 63 RB and the PCGS tag describes it as "Mule Die Clash Reverse - Discovery Coin."
It is fascinating that mint errors can still be found in circulation and in this case it is an exciting discovery coin and is unique to date. It is being widely discussed in numismatic circles as an exciting mint error.
A mule die clash occurs when two dies that should not have been paired together to strike coins are accidentally or intentionally paired and subsequently are clashed together without a planchet in the collar.
This Lincoln Cent discovery coin is the only known mule die clash from the 20th century and is unique to date.
There’s one type of Lincoln 1999 error mule Die Clash worth as much as $190,000!

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