What Are These? - Coin Community Forum

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Author	Replies: 9 / Views: 1,574
coop Bedrock of the Community United States 62064 Posts	Posted 12/04/2010 5:40 pm Poll Question While going through coins in OBW rolls or cello mint wrapped cent or even in circulated coins, you find unknown stuff and wonder what caused it. Here is one example from a mint set cello cent. It is a 1987-D: What are these? You find them on devices and fields. This coin helps us to see what they really are. Are they: Poll Choices Post mint damage? Bag marks? Intentional damage? Struck through errors? Die clash marks? Planchet damage? Die damage? Something else? Unknown? Edited by coop 12/04/2010 7:36 pm Report this Post to the Staff

Tim Stroud Pillar of the Community United States 2661 Posts	Posted 12/04/2010 8:04 pm That is a rare struck through booger error. They occur when someone at the mint sneezes on the die press. I am sorry man, I just could not help that one. But seriously I think it is a strike through. Report this Post to the Staff
vermontensium Moderator United States 16679 Posts	Posted 12/04/2010 8:33 pm I'm going with planchet damage. I don't think it's die damage as it would have caused this to be raised and not incuse, right? swcoin.ecrater.com Report this Post to the Staff
jasper62 Pillar of the Community United States 2189 Posts	Posted 12/04/2010 8:44 pm Looks like Die polishing line's in the area in question which makes me believe something was wrong with the Die. just a guess Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21786 Posts	Posted 12/04/2010 9:19 pm Tim Stroud: I think you may be close to the truth. It may be a droplet of oil from the minting press. SOME oils and greases are low viscosity but behave in very different ways under shock, as during the striking of a coin, where viscosity can increase to almost that of a solid. Some silicone greases can behave like that. For those who do not know, viscosity is a measure of the internal shear resistance of a liquid. It is usually measured in Poises. Edited by sel_69l 12/04/2010 9:26 pm Report this Post to the Staff
Tim Stroud Pillar of the Community United States 2661 Posts	Posted 12/04/2010 10:29 pm Quote: For those who do not know, viscosity is a measure of the internal shear resistance of a liquid. It is usually measured in Poises. He means how thick it is. As in catchup is more vicious than pancake syrup. Report this Post to the Staff
Indian1 Pillar of the Community United States 3640 Posts	Posted 12/05/2010 01:03 am That was a Chip on his shoulder. Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 12/06/2010 4:49 pm OK, it time to reveal the answers. Results: Post mint damage? [4%] 1 votes Bag marks? [0%] 0 votes Intentional damage? [0%] 0 votes Die clash marks? [4%] 1 votes Planchet damage? [19%] 5 votes Die damage? [15%] 4 votes Something else? [7%] 2 votes Unknown? [4%] 1 votes Now why the other answers are incorrect: Results: Post mint damage? [4%] 1 votes Still in sealed mint set with no damage to the cello. There is something more interesting in the area in question. Bag marks? [0%] 0 votes These can happen on mint sets and business strike coins and some proofs. But if it were a bag mark and dented the coin, it would have been in a straight line and short in length. Intentional damage? [0%] 0 votes When coins are taken to the garage to damage them, you can see if they used a punch and raised area opposite the damage area on the other side of the coin. Struck through errors? [48%] 13 votes This one is correct. Struck through can happen with different things. Thread, string, wire, cloth rim burs, grease, oil and other things that fall onto the dies or planchet during production of coins. The area in question is not grease. It is oil. How can you tell the difference? sel_69l has the correct answer. If it were grease if would have moved and left lines over a larger area. But a small drop of oil also leaves lines in the affected area. Many times we just think of grease, but oil also causes problems. Here are what to look for on struck through coins: https://www.coincommunity.com/forum...ASE_CENT.jpg https://www.coincommunity.com/forum..._obverse.jpg https://www.coincommunity.com/forum...e_Filled.jpg https://www.coincommunity.com/forum...XTURE_01.jpg https://www.coincommunity.com/forum...__Digits.jpg So the affect amy be similar, but the amount of the coin affected is usually the determine factor. Both are lumped into the strike through category, but now you know there are marks left in the area in question for both. https://www.coincommunity.com/forum...XTURE_02.jpg Die clash marks? [4%] 1 votes Die clash marks only affect the fields. But strong die clashes can affect deeper devices. Planchet damage? [19%] 5 votes The area in question is blocked from forming because of the strike through issue. Die damage? [15%] 4 votes Die damage would be shown as a raised area on the coin, this is incuse slightly. Something else? [7%] 2 votes incorrect. Unknown? [4%] 1 votes My answer to see how the voting was going. Hope this helps guys. Edited by coop 12/06/2010 4:53 pm Report this Post to the Staff
pls Rest in Peace United States 1729 Posts	Posted 12/06/2010 10:17 pm Excellent lesson, coop. Thanks. I learned something here. Report this Post to the Staff
Numisnut Valued Member United States 123 Posts	Posted 12/06/2010 10:25 pm I say it is struck through oil leaving a pothole. hehehehe Report this Post to the Staff
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