Can someone please educate me as I am unable to find a satisfactory explanation online. What, in the process, causes this. A collar clash I understand but not how a counter collar clash occurs.
I can find "Collar Clash"... "Collar clash Occasionally, the die shifts slightly out of position and, instead of fully striking the planchet, it partially strikes the collar. As with a die clash, the design of the collar, whether smooth or reeded, is transferred to the die. This, in turn, is transferred to the coins struck by the die. Most often, only the reeded collar clashed coins are of collector interest, but again, only if there is significant design transfer." https://conecaonline.org/glossary-of-error-variety-terms/ ...and I can find "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. There are currently 4 known type 2 counter-clashes in the Lincoln cent series. One on 1969S, two on 1983 cents, and one on a 1985 issue." http://www.lincolncentforum.com/terminology-list-c/ My guess is that a "Counter Collar Clash" is a Counter Clash of a Collar Clash. (very interesting!)
