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All Forums Category: US Coins and Currency Forums Forum: US Modern Coins

What Causes Different Types Of Proofs?

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Author	Topic
spruett001 Bedrock of the Community United States 10389 Posts	Posted 07/26/2017 02:58 am This is something I've been wondering about lately. I was looking for a 1955 Jefferson nickel proof tonight and with these, one can get a mirror proof, cameo proof and a deep cameo proof. Were the differences intentional? They all came from the same mint. What, during the minting process, causes the inconsistencies of proof type? It seems that what is intended can be reproduced ad infinitum. Why the variation? Tantum religio potuit suadere malorum. -Lucretius "Just because you're paranoid don't mean they're not after you." -Kurdt Kobain My Want List: http://goccf.com/t/282022 Report this Post to the Staff

MontCollector Pillar of the Community United States 2312 Posts	Posted 07/26/2017 03:34 am How clean/polished the dies are? Just a guess. Edited by MontCollector 07/26/2017 03:35 am Report this Post to the Staff
John1 Bedrock of the Community United States 30412 Posts	Posted 07/26/2017 05:06 am As the dies wear, it changes the kind of proof the coin will end up being. It starts out as a DCP then wears to a CP and then a brilliant proof with no frost at all. John1 ( I'm no pro, it's just my humble opinion ) Searched 5+ Million Cents Since 1971 Report this Post to the Staff
Andrew99 Pillar of the Community United States 1459 Posts	Posted 07/26/2017 10:06 am It used to be unintentional and was due to an early strike. Frosted coins from the 1940's and the 1800's are very expensive as they are rare. Sometime in the late 1960's the mint realized you can produce a deep cameo by sandblasting the die with ultra-fine powder and then polishing the flat surfaces. Thats why they all look like that now. Deep cameo's today are a matter of intentionality. Proofs from the early 1960's and before are not and so deserve a premium. The collection is in your mind. Dispose of your albums and free your mind from the tyranny of holes. Report this Post to the Staff
sel_69l Bedrock of the Community Australia 16099 Posts	Posted 07/26/2017 10:46 am Used to use sandblasting, but I think they use laser etching for cameo proofs these days. Fields would be polished with 50,000 or 100,000 diamond grit. That is what I use for final polish of faceted sapphires. (I also happen to be a gemstone facetor). Report this Post to the Staff
jpsned Pillar of the Community United States 1382 Posts	Posted 07/26/2017 10:36 pm Didn't they also have "matte" proofs in the old days? Report this Post to the Staff
spruett001 Bedrock of the Community United States 10389 Posts	Posted 07/26/2017 10:54 pm Thanks for the responses! I just never really thought about it until looking for nickel proofs around the late '50s to late '60s that seems to be a transition period. For instance, I have a '68 cameo proof and then a '70 brilliant proof and it made me go Is die wear also the reason for brilliant, PL and DMPL Morgan dollars? Tantum religio potuit suadere malorum. -Lucretius "Just because you're paranoid don't mean they're not after you." -Kurdt Kobain My Want List: http://goccf.com/t/282022 Report this Post to the Staff
coin197 Pillar of the Community United States 1963 Posts	Posted 07/27/2017 12:21 am Yes. On Morgan dollars, the more a die is used, the more luster you will see as a result of flow lines. Of course, it also depends on how bold the strike is. It also depends on how properly a die was hardened. On a real DMPL, you should see no 'cartwheels' whatsoever. Report this Post to the Staff
histman Valued Member United States 51 Posts	Posted 07/28/2017 11:00 pm Interesting question. I think Andrew99 has it right. They started doing it on purpose because of collectors. Report this Post to the Staff
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