Lamination Error Or PMD? - Coin Community Forum

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Author	Replies: 9 / Views: 1,353
Tlutz Valued Member Canada 56 Posts	Posted 01/09/2017 1:14 pm Found this in an old roll of pennies I had laying around. My initial guess was PMD but it does have a strange ripple effect. Let me know what you think of it. Thanks Report this Post to the Staff

John1 Moderator United States 56855 Posts	Posted 01/09/2017 1:28 pm I think PMD. The ripple look is caused by acid and sometimes heat.I see no sign of heat damage on the other side. John1 Report this Post to the Staff
darryldarryl Pillar of the Community Canada 2427 Posts	Posted 01/09/2017 2:02 pm PMD ! Report this Post to the Staff
rocky Pillar of the Community Canada 2784 Posts	Posted 01/09/2017 2:47 pm fuse penny. that was a very dangerous think to do. if you had fuses blown in your electrical panel. the old trick was to put a penny in first. then screw in a the fuse. of course the fuse would never blow. but it would heat the panel up some times blowing the main circuit. lot of houses burnt because of this trick. some times this will expand the penny. other times it will shrink the penny. wow that penny had gotten very hot. Report this Post to the Staff
Mark1959 Pillar of the Community 7234 Posts	Posted 01/09/2017 3:28 pm Quote: wow that penny had gotten very hot. Why wasn't the obverse effected if the entire coin was heated up? Report this Post to the Staff
SPP-Ottawa Moderator Canada 10460 Posts	Posted 01/09/2017 3:31 pm Not a "fuse penny"... bronze (which is 97.5% copper) is a conductor, and would not alter like that with normal household current. To me, this is a coin that was the victim of a steel file and then some battery acid... "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US My eBay store Report this Post to the Staff
rocky Pillar of the Community Canada 2784 Posts	Posted 01/09/2017 3:58 pm mark it depends which way you put the penny in the circuit. this one the the reverse was towards the circuit. thats where all the heat would be. yes copper is a good conductor. but where the fuse is installed in a panel. the amperage can increase to point. where even the conductor themselves melt. that why fuses have been done away with in modern homes. I have worked thermovision. you can only imagine how hot some of these panels was getting. Report this Post to the Staff
Mark1959 Pillar of the Community 7234 Posts	Posted 01/09/2017 4:22 pm Quote: mark it depends which way you put the penny in the circuit. I see, thanks for the info! Report this Post to the Staff
DBM Pillar of the Community Canada 9865 Posts	Posted 01/10/2017 12:22 am This penny was not used as a fuse. A bronze penny can carry a tremendous current, wires in the circuit and the fuse holder would melt long before you'd see this kind of damage to the penny fuse. Sometimes a little melting due to arcing will show on the penny. "Dipping" is not considered cleaning... -from PCGS website Report this Post to the Staff
DEVLEC Pillar of the Community Canada 3234 Posts	Posted 01/10/2017 08:52 am Quote: To me, this is a coin that was the victim of a steel file and then some battery acid... This description is probably the best one here. Filed or passed on a grinder a bit later and held up and had the acid run off from the 3 o'clock position down towards the 9 o'clock position. Ripples showing in one direction towards the left here...IMO Report this Post to the Staff
	Replies: 9 / Views: 1,353

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