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 Replies: 37 / Views: 4,172 |
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Pillar of the Community
United States
3330 Posts |
Edited by Pete2226
07/13/2015 5:49 pm
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Pillar of the Community
United States
1414 Posts |
Looks like a die gouge to me...but let the experts tell you...first, I've heard of that Rockwell test, thanks for the info!
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Pillar of the Community
 United States
3330 Posts |
Quote:
Looks like a die gouge to me I do not think it can be a die gouge because it is incuse. It appears at least 1 mm deep, if not more. Edited by Pete2226
07/13/2015 5:53 pm
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Pillar of the Community
United States
6478 Posts |
Looks like the collapsing in stage of zinc rot.
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Pillar of the Community
United States
3330 Posts |
Quote:
Looks like the collapsing in stage of zinc rot. There are 2 reasons why zinc rot did not occur to me: 1. The inside of the feature is perfectly smooth. I have never seen zinc rot so smooth. 2. The circumference is a clearly demarcated edge - maybe slightly elliptical, but almost circular. I have never seen that in zinc rot. |
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Rest in Peace
United States
7075 Posts |
I don't know. Your coin does have a rather perfect little circle there but the damage to the coin in the link looks a lot smoother to me.  So much to learn! |
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Pillar of the Community
United States
2775 Posts |
Pete2226, Afraid we may need to put your close up abilities to test. Currently can't tell how clean the depression is. Could be a test mark or could be a dot from a ball point pen or punch.
Thanks, Doug.
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Pillar of the Community
United States
3330 Posts |
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Pete2226, Afraid we may need to put your close up abilities to test I was afraid you were going to say that! Here are a couple of photos with different lighting.   |
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Moderator
 United States
56855 Posts |
I'm not sure. I was thinking if you took a BB and placed it on the coin and then hit it I think it would leave a mark like that. John1  |
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Pillar of the Community
United States
2376 Posts |
The thing I like about it is the direction of the oval. Coin metal would flow towards the columns on the right and left were this a Rockwell test mark thus stretching the hole in the exact directions as shown here
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Pillar of the Community
United States
1414 Posts |
So, with a die gouge, it would be a bump and a die chip would be incuse?
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Pillar of the Community
United States
3330 Posts |
Quote:
The thing I like about it is the direction of the oval. Coin metal would flow towards the columns on the right and left were this a Rockwell test mark thus stretching the hole in the exact directions as shown here I am most impressed that you know this! What little reading I have done on the Rockwell test did not mention this - or else I missed it. Thank you. |
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Pillar of the Community
United States
3330 Posts |
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So, with a die gouge, it would be a bump and a die chip would be incuse? My understanding is that both a die gouge and a die chip leave an incuse area on the die thus leaving a raised area on the coin. My knowledge is quite limited so I am sure someone will correct me if I am wrong!  |
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Pillar of the Community
United States
2376 Posts |
Hi pete, you are correct about die gouges and chips.
My knowledge of Rockwell test marks is limited. One older reference I have read states that they are almost impossible to prove 100%. I refreshed myself with the link you provided. In your link there was info about there possible oval shape. I am somewhat familiar with how coin metal flows towards voids in the die. Note how the coin in your link has the long part of its oval following the column and the narrow part bordering the flat field between columns. This is basically what your coin shows. Could this shape have come from another source, most certainly.
As I said the Oval shape I like
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Pillar of the Community
United States
1414 Posts |
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Bedrock of the Community
United States
62064 Posts |
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Replies: 37 / Views: 4,172 |
Posted 07/13/2015 5:41 pm
