1992 Lincoln Cent What Is This? - Coin Community Forum

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Author	Replies: 5 / Views: 717
CoinMasters Pillar of the Community United States 5964 Posts	Posted 09/20/2017 4:18 pm I would think there's a simple explanation for this. There are raised lines on both sides of the coin. If I don't flip the coin, they are running in the same direction. That tells me whatever caused them occurred on both sides at the same time. They are not solid lines, they appear to be made up of aligned plating bubbles. My theory is there is a time in the minting process when both sides of the planchet simultaneously slides against something dirty, maybe grease. The planchet is later struck into a coin, and after that the substance on the coin (in the slide areas) loosens the plating and forms these lines. If my theory is incorrect please correct me. If it is correct, I'd appreciate knowing more about the time period the substance gets on the coin. I have links to the minting processes, I just thought maybe someone would share this particular part with me. Report this Post to the Staff

biokemist6 Bedrock of the Community United States 12437 Posts	Posted 09/20/2017 4:42 pm It is not necessarily related to plating, the lines can be present on unplated zinc blanks. I believe it is related to the process used to set the thickness for the zinc stock sheets. Report this Post to the Staff
CoinMasters Pillar of the Community United States 5964 Posts	Posted 09/20/2017 4:58 pm Very interesting, thank you. Do you know if the lines on unplated zinc blanks are raised? Report this Post to the Staff
moxking Rest in Peace United States 17900 Posts	Posted 09/20/2017 5:06 pm I've seen this question before, but biokemist gave the most understandable explanation. Report this Post to the Staff
CoinMasters Pillar of the Community United States 5964 Posts	Posted 09/20/2017 5:13 pm I'm thinking maybey the lines on the unplated zinc blanks are the substance in my theory. Report this Post to the Staff
CoinMasters Pillar of the Community United States 5964 Posts	Posted 09/20/2017 7:46 pm The raised lines on my coin only occur on plated cents. They are not plating bubbles though, because they won't smash down like plating bubbles will. I have concluded that the cause of these lines on modern cents is the inadequacy of the zinc composition to withstand the imperfect process used for setting the thickness of the stock sheets consistently without lines. Now we know the cause of these lines. I think that should be abbreviated to IZAITP. That stands for Inadequate Zinc and Imperfect Thickness Process. The thickness process is imperfect because sometimes it works fine. It was good enough, until the switch to the less resilient zinc. Report this Post to the Staff
	Replies: 5 / Views: 717

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