Guess the Error. 1979 Ten Centavos......

Hello all collectors! I saw this error coin online and thought it was very awesome. Can you guess the error here and how did it occur?

 

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It was struck off center w a partial brockage.

 

Huh. I can't hear you.
Tell the newbies what a "partial brockage" is? How did it happen?

 

One previously struck coin ( on bottom, Brockage coin, not shown) and a new planchet (ontop) were in the coining chamber at the same time, and both were struck together.
Is this close to correct?

 

A brockage is technically a die cap, a coin that was previously struck stuck to the die face. Now the die face that is in this case supposed to be the obverse, has a coin stuck to it. The coin that is stuck acts like a new die face and strikes more coins until it gets thinned out or falls off. The OP's coin shows that the coin that became stuck only partially covered the die face.
Below is from Error Reference.
https://www.error-ref.com/page/2/?s=Brockage
Brockage: Partial
PART VI. Striking Errors:
Brockages:
Partial Brockage:

Definition: A brockage is an incuse, mirror-image version of the design that is generated when a coin (or other struck piece of metal) is struck into a planchet or another coin. A partial brockage occurs when there is partial overlap between the two discs involved.

This 1980 cent has a partial brockage of the reverse design on its obverse face. A previously-struck coin overlapped the planchet represented by this cent. This coin was struck fully within the collar. The increased effective striking
pressure caused by the intrusive coin produced some “horizontal lipping”, as coin metal squeezed over the top of the fully-deployed collar. Many coins with partial brockages are struck out-of-collar (broadstruck).

 

I could have sworn it was parking lot damage! Thanks for posting and the info.

 

Nope. just another cool error from the 70's.