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

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Author	Replies: 6 / Views: 1,494
Oijogja Pillar of the Community United States 715 Posts	Posted 01/17/2020 7:27 pm 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. Report this Post to the Staff

sel_69l Bedrock of the Community Australia 21788 Posts	Posted 01/17/2020 7:37 pm 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 Report this Post to the Staff
lawest Pillar of the Community United States 1998 Posts	Posted 01/17/2020 7:47 pm Looks like post strike to me, I think the Rockwell test is done on the metal prior to being struck by the die. Report this Post to the Staff
Oijogja Pillar of the Community United States 715 Posts	Posted 01/17/2020 7:55 pm 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. Report this Post to the Staff
lawest Pillar of the Community United States 1998 Posts	Posted 01/17/2020 8:23 pm Can you post a pic of the reverse of the 1998? Report this Post to the Staff
Oijogja Pillar of the Community United States 715 Posts	Posted 01/17/2020 8:41 pm Here ya go, reverse of the 1998-D. Report this Post to the Staff
lawest Pillar of the Community United States 1998 Posts	Posted 01/17/2020 10:02 pm The 1998 also looks post strike damage, there seems to be a raised ridge around the indent Report this Post to the Staff
	Replies: 6 / Views: 1,494

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