1974 Error Cent?

Quite often, grease and debris from the machinery will form in the depths of a device. As planchets are continually struck and made into coins, the build-up of grease and debris becomes compacted and very hard. Sometimes it will fall out of the device onto a new planchet where it is then impressed by the hammer die. This is called a strikethrough. Most often, the debris causing the strikethrough will fall out of the coin, but when it remains embedded in the coin, it is called a retained strikethrough.

If you search our forums for "grease-filled die" and "strikethrough" or "struck through" you will find many threads on this subject.

Chris

 

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OK - just trying to learn - if it was that thin would it have cause that much distortion on the planchet? I didn't say "Infected"

 

You didn't say "infected" and I didn't say that the build-up of debris within the strikethrough had to be uniformly thick or thin. What if the build-up tapers toward the shallower part of the device?

Chris

 

So if it remains imbedded in the coin its a strikethrough. If it does not remain on the coin (like this 74 LMC), what is it called?

 

When it remains embedded in the coin, it is called a retained strikethrough. When it falls away from the coin, the impression is still visible on the coin so it is just called a strikethrough.

Chris

 

@Matthew Peak

Here are some images of strikethroughs.

https://www.bing.com/images/search?...a+coin&qpvt=strikethrough+on+a+coin&FORM=IGRE

@Markus1959

If you scroll down through the images I linked above, you will see some strikethroughs that have not affected the devices.

Chris

 

This is one close to yours, I pulled it from some cwr's a couple weeks ago.
This has partly taken some of the Bust. You can see that the date and mm are mostly there, even with the loss of the lamination.