| Author |
 Replies: 9 / Views: 1,071 |
|
|
Pillar of the Community
United States
3003 Posts |
hello all, there are two round dome like raised areas on the obverse. the one on the shoulder is larger then the one by the date. I tried poking the one on the shoulder with a tooth pick. I dont know if it was a miss but nothing happened. they look solid. http://www.error-ref.com/rockwell-t...left-in-die/could this be a Rockewell Test Mark on the die? thoughts anyone? thanks for viewing     |
|
|
|
Pillar of the Community
United States
1427 Posts |
|
|
Bedrock of the Community
United States
10635 Posts |
From ERROR-REF.COM: "When applied to a planchet, the Rockwell test mark will appear as a small circular pit with a smooth floor." Your marks appear to be raised, not depressed. Also I would expect "test marks" to be uniform in appearance. Your marks are interesting nonetheless.  http://www.error-ref.com/rockwell-t...in-planchet/ |
|
Moderator
 United States
56855 Posts |
Not Rockwell,use the search box lots of info there. Looks like some kind of plating debris. John1  |
|
Pillar of the Community
 United States
3003 Posts |
thanks That coin dude, merclover, John1
|
|
Pillar of the Community
United States
5797 Posts |
That link is to the test on planchets which is why it is described as recessed with a smooth floor. Since these are raised, the question really is whether this is a test on a die. Link to Rockwell Hardness test on dies- http://www.error-ref.com/rockwell-t...left-in-die/In part it says: "A Rockwell test mark will appear on a die face as a small pit. On a coin it will appear as a tiny dome-shaped or cone-shaped elevation. It is most likely to appear in the field. No unambiguous examples of Rockwell test-marked dies are known among U.S. coins. This is not surprising as a Rockwell test mark is very hard to distinguish from a small circular die dent." Sorry LOM, doesn't look like it can be proven that it is. And if you could, the two on your coin are different diameters so that would probably rules out both being a Rockwell Hardness test on the die. Here's another link for more info with diagrams. https://www.paulo.com/hardness-test...crohardness/And another link with images of some machines used for the tests. (not necessarily at the mint though.) https://www.testhardness.com/produc...AmEaEALw_wcBWords of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
|
|
Pillar of the Community
United States
3003 Posts |
thanks Petespockets55
i will place it in the I dont know pile for now.
|
|
Pillar of the Community
United States
5797 Posts |
To be clear- IMHO I don't think either would qualify even if there was a way to prove it. The one on the right isn't a perfect circle and the one by the date seems too close to the rim.
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
|
|
Bedrock of the Community
United States
62064 Posts |
If you look close and see a small gray center, then that area may have been hit with a needle. When the zinc gets oxygen, then it starts to swell upwards. But I don't seeing it in the images provided.
|
|
New Member
United States
43 Posts |
Looks like contamination under the cladding
|
| |
Replies: 9 / Views: 1,071 |
|
Posted 01/31/2021 6:46 pm
