Please Post Your Coins Which Have A Hemispherical Depression - Page 7

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Author	Replies: 142 / Views: 22,492	Page: of 10

Suspense84 New Member United States 26 Posts	Posted 05/13/2018 1:54 pm Rockwell test diamond marks on quarter Report this Post to the Staff
Suspense84 New Member United States 26 Posts	Posted 05/13/2018 1:56 pm Here's my penny with Rockwell test mark Maybe Report this Post to the Staff
Pete2226 Pillar of the Community United States 3331 Posts	Posted 05/13/2018 2:21 pm Not Rockwell test marks on the quarter (the Rockwell Test Indenter has a shape which is hemispherical) and the cent is doubtful - too much glare to see clearly. Edited by Pete2226 05/13/2018 3:44 pm Report this Post to the Staff
Pete2226 Pillar of the Community United States 3331 Posts	Posted 05/13/2018 3:54 pm CONECA has revised their website and there is now a new link to the Rockwell Paper: https://conecaonline.org/rockwell-h...ncoln-cents/ Report this Post to the Staff
Coppergold Pillar of the Community United States 939 Posts	Posted 05/13/2018 7:06 pm Well this sucks, I did have one of those a long time ago but I thought someone shot it with a Bee bee gun Report this Post to the Staff
Pete2226 Pillar of the Community United States 3331 Posts	Posted 05/14/2018 08:49 am Quote: I did have one of those a long time ago but I thought someone shot it with a Bee bee gun The primary indicator of such a strike is an "anvil effect" on the opposite side of the coin from the depression. An "anvil effect" is a raised area corresponding to the shape and depth of the depression. Report this Post to the Staff
stevieb Valued Member United States 270 Posts	Posted 05/14/2018 12:49 pm Hello gang! I'm really new to this but it looks like it was used for target practice with a BB gun Report this Post to the Staff
SilverDollar2017 Pillar of the Community United States 8715 Posts	Posted 05/14/2018 12:51 pm Suspense84, those are not Rockwell test marks. Just bag marks. Report this Post to the Staff
Pete2226 Pillar of the Community United States 3331 Posts	Posted 05/14/2018 1:32 pm Quote: it looks like it was used for target practice with a BB gun If you are referring to the cent (the last coin posted) We need to see if there is an anvil effect on the other side of the coin, although there might not be one if it was an extremely light hit. The mark appears to be approximately 0.75 mm in diameter. A BB is approximately 4.4 mm. A close up of the depression may show that it is shallow enough to be from a light hit. The slope of the sides of the depression is key to understanding. Also a close up photo might help us see whether there is a pressure ridge. There is a discussion about this in Appendix B of the paper referenced. Link to the paper: https://conecaonline.org/rockwell-h...ncoln-cents/ Report this Post to the Staff
stevieb Valued Member United States 270 Posts	Posted 05/15/2018 12:38 pm I might be way off base but it looks like somebody shot them with a bb gun. Report this Post to the Staff
stevieb Valued Member United States 270 Posts	Posted 05/15/2018 12:40 pm Im sorry I forgot that I've already put in my Two Cents Report this Post to the Staff
piercethegrimes Valued Member United States 260 Posts	Posted 07/03/2018 2:19 pm While I was searching early 1960's proof cents for doubled die reverses I came across this crater like mark on the reverse of a 1963 proof cent. It's difficult to tell if there is a corresponding "bump" on the obverse as it would be located on Lincoln's bust. Thought this might be the thread to post it in Report this Post to the Staff
Pete2226 Pillar of the Community United States 3331 Posts	Posted 07/03/2018 2:30 pm Very interesting! It is a bit larger diameter than would be expected for a Rockwell Test Mark. Also the inside of the mark does not appear to be smooth - which it needs to be for a Rockwell Test Mark. At the same time I do not detect a pressure ridge - which would certainly rule out a Rockwell Test Mark. Thanks for posting! Report this Post to the Staff
piercethegrimes Valued Member United States 260 Posts	Posted 07/03/2018 2:36 pm The inside of the mark is not smooth as shown in the article linked above but like you said there doesn't appear to be a pressure ridge. This coin was still in the proof cello when found. Report this Post to the Staff
Pete2226 Pillar of the Community United States 3331 Posts	Posted 07/03/2018 2:48 pm In attributing a Rockwell Mark, you do not want a pressure ridge to be present. That is the one thing your coin has going for it. The other 2 points suggest it is likely not a Rockwell Test Mark. Report this Post to the Staff
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