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 Replies: 12 / Views: 766 |
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Pillar of the Community
United States
599 Posts |
I was reading about planchet errors at error-ref.com and I read about this one called a Rockwell test mark in planchet. I'm wondering if that's what's going on with this penny. The article described them as pellet-shaped, whereas this one is triangular so it might be something else. Can anyone help me figure this out?   |
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Bedrock of the Community
United States
19134 Posts |
Given the images posted, it appears to be a matter of post-strike damage.
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Bedrock of the Community
United States
73874 Posts |
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Pillar of the Community
 United States
599 Posts |
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Moderator
 United States
34397 Posts |
@sick, just in case you are interested to learn a little bit more about hardness testing, the below graphic comes from the website of one of the manufacturers of this equipment. While different hardness tests may use different shape indenters, I believe that these all would look like a round impression in the surface of the metal. The difference in diameters of the impression made by a low penetrating force and a high one is quantified and translated into a hardness value.  "If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
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Moderator
United States
95324 Posts |
very cool spence!
But this coin is just damaged.
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Pillar of the Community
United States
3207 Posts |
massively oversize photos of, I think, a cent
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Pillar of the Community
 Canada
9862 Posts |
Looks like someone named Rockwell was testing their hammer and nail.
Thanks for that informative graphic Spence.
"Dipping" is not considered cleaning...
-from PCGS website
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Moderator
United States
56855 Posts |
sickpuppy78501, Please use the search box here on CCF. We get the "rockwell" question more than a few times every year. Tons of useful info using the search box. John1  |
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Bedrock of the Community
United States
94367 Posts |
An invaluable tool indeed.
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Pillar of the Community
United States
2404 Posts |
While I'm here I'll ask before I go look it up on CCF search bar.
Do they check a coin on a certain side and location?
Copper and Clads?
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Moderator
United States
34397 Posts |
From the error-ref website: Quote:
All alleged Rockwell test marks in planchets are now considered suspect, including the 1971-S cent described above. My personal assumption is that every single one of these is just damage. Honestly, I'd look elsewhere for mint errors rather than this rabbit hole. "If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
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Pillar of the Community
United States
2404 Posts |
 . Spence. |
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Replies: 12 / Views: 766 |
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Posted 10/11/2023 9:01 pm
