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1938 Jefferson Nickel - Pit Looks Like Pin Hole No Pressure Ridge

 
 
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 Posted 11/20/2019  11:00 pm Show Profile   Check tropicalbats's eBay Listings Bookmark this topic Add tropicalbats to your friends list Get a Link to this Message
No clue if this is even close to what a Rockwell test would look like, but can't come up with anything other than an impurity nodule that popped out. Does not look like PSD.

My only thought is that if you were looking to test planchet hardness, then likely you would do it on the first year of a new coin series.

Ideas welcome.

1938 Jefferson nickel - round pit ~ 1mm deep






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 Posted 11/20/2019  11:30 pm  Show Profile   Check Yokozuna's eBay Listings Bookmark this reply Add Yokozuna to your friends list Get a Link to this Reply
I don't think it's damage either. It's interesting that it dead in the center of a band of a different shade of metal. I've heard of the Rockwell test, but I've never seen one in hand. I think this has something to do with the alloy mix. As you said, maybe caused by an impurity.

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 Posted 11/21/2019  02:22 am  Show Profile   Check spruett001's eBay Listings Bookmark this reply Add spruett001 to your friends list Get a Link to this Reply
My understanding is that Rockwell tests are typically performed at the approximate center of the planchet. Also, the shape, while not circular, is not oval either. The irregularity of the shape suggests to me that this is struck through debris. It could even have been a grain of sand.
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 Posted 11/21/2019  03:30 am  Show Profile   Bookmark this reply Add Daves Errors to your friends list Get a Link to this Reply
Not looking like a Rockwell Test to me https://conecaonline.org/rockwell-h...ncoln-cents/
Edited by Daves Errors
11/21/2019 03:33 am
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 Posted 11/21/2019  08:40 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
For what it's worth,my first thought was struck through some type of debris.
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 Posted 11/21/2019  10:25 am  Show Profile   Bookmark this reply Add Petespockets55 to your friends list Get a Link to this Reply
I agree that the overall shape doesn't match a Rockwell test. In the field like this, it should be round (or possibly pyramidal?)

EDIT: Pyramid is on Vickers testing.

Link to different types of hardness testing.
https://www.hardnesstesters.com/tes...ness-testing .
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