This coin has been the subject of a recent thread. It has planchet flaws we call Laminations. Please post your error coins and tell us what the error is called.
I have mainly minor errors, strike throughs, lamination etc. The most notable one I have is a Canadian cent with a reverse counter clash Counter-clash: This is when already-clashed dies clash together a subsequent time, and the clashed design from the opposite die is re-imprinted back (in original orientation) on its die of origin in an off-set position. This is called a Type 1 counter-clash. A type 2 counter-clash occurs when a foreign piece of metal between the dies is struck with part of a die’s design and then a subsequent clash event transfers that design from the foreign object back onto one of the dies in a new position. counter
This is my only error coin. I am not an error collector but this one was a childhood dream coin for me. I grew up calling it a 55 Double Die... However as I understand it the correct terminology is Doubled Die.
When you post, please, especially for the newbies, state what the error is that you have. It may help new collectors, and us old folks with bad eyesight
Another type of error coin I find interesting is brockage errors. This is my Great Britain 6 pence brockage example. I like the coin showing portrait on both sides.
I think I ended up selling to a specialist more than a decade ago for around $850. These two error coins were produced when two planchets got caught between the dies when they were struck. Somehow both coins got out of the mint, and both coins were found together.
I have never owned a brockage error. I knew a fellow when I lived in New Jersey who had a Matron Head large cent circa 1816 to the mid 1820s that was a brockage with the reverse. It was quite unique, but he was not about to sell it.
A partial tilted collar strike on a 2000-D Roosevelt. Posted in errors a few weeks back, but it's my best error (so far).