Kennedy Half Dollars Is This From Hardness Testing?

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Author	Replies: 12 / Views: 966
gsp193 Pillar of the Community United States 975 Posts	Posted 11/09/2021 10:03 pm What are the divots to the right of Kennedy? They are in almost exact same place. I have found 5 of these from three different boxes of halves. I was wondering if this was from hardness testing. Thanks in advance. As requested here are the reverse pics (I think the third and fourth need switched around) Here is the 5th one which is a bit different it does not has a raised place on reverse. Edited by gsp193 11/10/2021 08:38 am Report this Post to the Staff

sel_69l Bedrock of the Community Australia 21788 Posts	Posted 11/09/2021 10:57 pm Pits do not appear to be indents for the Brinell Hardness test for metals. The Brinell test is done with a spherical point tip of standard diameter under a standard load. The resulting diameter of the pit is measured and compared to the Brinell Scale for hardness. The shape of the pits in the pictures do not appear to be spherical. Report this Post to the Staff
gsp193 Pillar of the Community United States 975 Posts	Posted 11/09/2021 11:01 pm Thanks sel I just thought it was strange, I appreciate it Report this Post to the Staff
spru Bedrock of the Community United States 12477 Posts	Posted 11/09/2021 11:18 pm As I understand it, hardness tests are performed on dies, not coins, so the mark would be raised on the coin instead of an indentation. In Memory of Crazyb0 12-26-1951 to 7-27-2020 In Memory of Tootallious 3-31-1964 to 4-15-2020 In Memory of T-BOP 10-12-1949 to 1-19-2024 Report this Post to the Staff
gsp193 Pillar of the Community United States 975 Posts	Posted 11/09/2021 11:54 pm Thanks spruett001! Report this Post to the Staff
John1 Moderator United States 56855 Posts	Posted 11/10/2021 04:34 am http://www.error-ref.com/rockwell-t...in-planchet/ Report this Post to the Staff
Dearborn Moderator United States 96935 Posts	Posted 11/10/2021 05:32 am Can you post up pictures of the same area of the reverse side for each coin? (hopefully in the same order) Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21788 Posts	Posted 11/10/2021 07:22 am The metal hardness for a die may be known, but would not be tested after the die has been manufactured, because the test pit would always show as raised pimple on every coin that was struck from it. Report this Post to the Staff
BigSilver Pillar of the Community United States 2843 Posts	Posted 11/10/2021 08:33 am My theory: those are a roll hunter's marks. Many hunters use marker or paint to mark groups of coins that they've already searched. Some, I've seen, go with a more permanent mark. I'd bet that's what you have here Edited by BigSilver 11/10/2021 08:34 am Report this Post to the Staff
Coinfrog Bedrock of the Community United States 94367 Posts	Posted 11/10/2021 09:45 am Now that's an interesting theory! Report this Post to the Staff
gsp193 Pillar of the Community United States 975 Posts	Posted 11/10/2021 09:53 am Thanks BigSilver Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 11/10/2021 10:59 am Just damaged with a punch and a hammer in a garage. (Not a mint location) Just post strike damage. Report this Post to the Staff
gsp193 Pillar of the Community United States 975 Posts	Posted 11/10/2021 11:01 am thanks John1 and everyone Report this Post to the Staff
	Replies: 12 / Views: 966

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