1976 Bi-Centenial Quarter - Coin Community Forum

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Author	Replies: 8 / Views: 1,423
Cross-eyed Pillar of the Community United States 849 Posts	Posted 05/13/2015 3:50 pm What do you think it grades?And does the MD effect it? Report this Post to the Staff

SilverStackerKid Pillar of the Community United States 6478 Posts	Posted 05/13/2015 3:57 pm Pr64? I am not good with proofs. I don't think md like that will actually effect the grade. It has carbon spots so I am saying pr64. Report this Post to the Staff
Joseph7420 Bedrock of the Community Canada 11922 Posts	Posted 05/13/2015 9:45 pm I think it could make MS-67. Report this Post to the Staff
edweather Pillar of the Community United States 7375 Posts	Posted 05/14/2015 12:47 am Unfortunately the spots are very distracting. PR66 Report this Post to the Staff
Cross-eyed Pillar of the Community United States 849 Posts	Posted 05/14/2015 08:06 am Can carbon spots be treated in some way to stop the progression of it? Report this Post to the Staff
aardspeed Pillar of the Community 921 Posts	Posted 05/14/2015 10:18 am great coin....arg to the carbon spots though Looked up what causes carbon spots and found this: "These dark brown to black spots appear on both copper (including bronze) and silver coins (including silver clad). These are formed, not with contact with carbon, but contact with sulfur from the environment. The sulfur comes from any variety of sources. The curing of rubber, for example, includes sulfur by vulcanization (thank you, Charles Goodyear!). Thus rubber should never come in continuous contact with coins and medals. Sulfur is also used in some manufacturing processes of paper. This is why coins tone in certain paper envelopes. Anti-tarnish tissue is made without any sulfur at all" http://www.coinbooks.org/esylum_v07n16a16.html Very interesting read... Report this Post to the Staff
panzaldi Bedrock of the Community United States 18706 Posts	Posted 05/14/2015 6:24 pm Carbon spots on the obverse at 11 on the rim and below the mintmark. On the reverse at 4 on the rim and the E in quarter. PR64. Could go to 63 if thats a scratch from the eye to the ear Report this Post to the Staff
Cross-eyed Pillar of the Community United States 849 Posts	Posted 05/15/2015 08:25 am aardspeed,Thanks for the link. Quote: panzaldi: Could go to 63 if thats a scratch from the eye to the ear Its not a scratch.Its some kind of discoloration.Probably from the same thing that started the carbon spots. I had to crack it out of the mint holder to photograph it. So I wonder...how did the sulfur get too it in the first place,being encased in plastic? Do they use glue to stick the holder together?I had to destroy it to get the coin out. Report this Post to the Staff
CoinCollector2012 Pillar of the Community United States 8137 Posts	Posted 05/15/2015 10:04 am PR-65 Report this Post to the Staff
	Replies: 8 / Views: 1,423

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