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 Replies: 10 / Views: 1,001 |
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Pillar of the Community
United States
6207 Posts |
Haven't really seen one of these before, but shouldn't clipped unstruck planchets be fairly common? I searched around a bit but couldn't find any others so maybe not. Anyway, this appears to be a double clip (one really minor clip opposite the stronger one) of an unstruck planchet. No date Lincoln Cent mint error - double clipped unstruck planchet   |
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Pillar of the Community
1110 Posts |
Is it a double clip or Blakesley Effect?
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Bedrock of the Community
United States
94367 Posts |
Just an ignorant booger hanging around to learn something.
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Pillar of the Community
 United States
6207 Posts |
It can't be the Blakesley Effect as that occurs during the strike. When a coin with an incomplete planchet is struck it can create a weakness on the rim opposite the missing bit, but this planchet wasn't struck so pretty much has to be a second very light clip.
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Pillar of the Community
United States
1543 Posts |
Quote:
When a coin with an incomplete planchet is struck it can create a weakness on the rim opposite the missing bit, but this planchet wasn't struck so pretty much has to be a second very light clip. What are the chances the upsetting mill did that because there was nothing to push on opposite? It looks like it might be slightly oblong. Edited by Gincoin43
11/05/2020 10:39 pm
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Pillar of the Community
United States
6207 Posts |
That would seem to be a possibility. Hadn't considered that and would make sense.
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Pillar of the Community
United States
2156 Posts |
Nice one! Don't see a lot of clips on blank planchets.
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Pillar of the Community
1110 Posts |
Thanks for that explanation tropicalbats!  ! |
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Pillar of the Community
 Canada
9909 Posts |
Quote:
What are the chances the upsetting mill did that because there was nothing to push on opposite? About 100% That is exactly what happened. The Blakesley effect occurs before the strike. "Dipping" is not considered cleaning...
-from PCGS website
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Pillar of the Community
United States
1543 Posts |
Quote:
The Blakesley effect occurs before the strike I think that only describes what happens after strike, maybe you can get this one named after you  |
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Pillar of the Community
United States
6207 Posts |
Interesting. I know you can get a weakness opposite the clip during the upset mill process, but always assumed the Blakesley effect was the expression of inefficient metal flow during the strike. Totally related, but since I've no experience with a clipped unstruck planchet I wouldn't have thought that a poorly formed proto rim across from the clip would also be called the Blakesley effect.
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Replies: 10 / Views: 1,001 |
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Posted 11/05/2020 10:20 pm
