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How Do You Identify A Rockwell Test Mark In Planchet Error?

 
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United States
715 Posts
 Posted 01/17/2020  7:27 pm Show Profile   Bookmark this topic Add Oijogja to your friends list Get a Link to this Message
http://www.error-ref.com/rockwell-t...in-planchet/

For the 1971-S cent shown in the above linked article, the cupped depression is smooth. Would this still be the case with a clad coin? I have found this 1984-P half dollar that got me wondering.



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Bedrock of the Community
Australia
16643 Posts
 Posted 01/17/2020  7:37 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
Brinell hardness test (used for metals) is similar.
The ball diameter is standard; I don't know what that is, but it is in the same ball park as a Biro ball.

Which brings me to another point:- it could be an indent by a Biro pen, but I don't think so.
Edited by sel_69l
01/17/2020 7:43 pm
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United States
945 Posts
 Posted 01/17/2020  7:47 pm  Show Profile   Bookmark this reply Add lawest to your friends list Get a Link to this Reply
Looks like post strike to me, I think the Rockwell test is done on the metal prior to being struck by the die.
Pillar of the Community
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 Posted 01/17/2020  7:55 pm  Show Profile   Bookmark this reply Add Oijogja to your friends list Get a Link to this Reply
Well let's call this a curious coincidence. Check out this 1998-D half that I found with a similar mark in almost the same exact spot. Weird.

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 Posted 01/17/2020  8:23 pm  Show Profile   Bookmark this reply Add lawest to your friends list Get a Link to this Reply
Can you post a pic of the reverse of the 1998?
Pillar of the Community
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 Posted 01/17/2020  8:41 pm  Show Profile   Bookmark this reply Add Oijogja to your friends list Get a Link to this Reply
Here ya go, reverse of the 1998-D.

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 Posted 01/17/2020  10:02 pm  Show Profile   Bookmark this reply Add lawest to your friends list Get a Link to this Reply

The 1998 also looks post strike damage, there seems to be a raised ridge around the indent
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