1971-D Lincoln Memorial Cent. RIDB - Coin Community Forum

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Author	Replies: 4 / Views: 790
RobO411 Pillar of the Community United States 2404 Posts	Posted 03/19/2021 4:21 pm Would you call this RIDB? Going to send to Cudsoncoins but wanted to make sure. Thank you for looking and opinions. Report this Post to the Staff

coop Bedrock of the Community United States 62064 Posts	Posted 03/19/2021 4:43 pm Well to me it looks like a struck through debris on that area. Usually in an Retained Internal Die Break, this happens on certain areas of this design. This is not one of them. It is not elongated like a lamination, but it looks like it could be peeled off the coin. (Don't do that) but there is probably an area on the struck through that might be loose. On a RIDB, this would not peel off and would be surrounded with a raised die crack. Probably weighing the coin won't tell if it is over weight or not, as the debris looks pretty small. Report this Post to the Staff
John1 Moderator United States 56855 Posts	Posted 03/19/2021 5:12 pm Weigh it anyway. Looks like a struck through copper foil. John1 Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 03/19/2021 5:31 pm Kind of looks like flattened chewing gum, but copper? Report this Post to the Staff
silviosi Pillar of the Community Canada 6244 Posts	Posted 03/19/2021 7:41 pm Yes COOP, look on some parts not all. I refer most to the base of the columns. Seem like quote " looks like flattened chewing gum". In one of my others answers I state that a tinny copper debris (not thick) on the dies could be cold molded at only 10 tons strike force. At 40 tons coins strike for alloy copper will accentuate this effect. We say cold molding, employed in metallurgical industry. What is happened? : Due to the force applied, the structure (molecular) will deformed, so on both sides we will have enlarged molecules which will fusion together letting see like a same material. Also this transfer will happened between two materials with similar characteristics. Will never mold or incuse in the die which need 300 to 400 tons force to incuse. Also in most of the cases this cold molding seem to be like exfoliation but it is not. Exfoliation always will have the borders raised, not on cold molding. Example of this procedure the cupola of Notre Dame church in Montreal. Very big, but was use only 20 grams of gold. Hope can help. If some one have any commentary on this please address, welcome. Do not hesitate please because it is an interesting issue for old mint procedures. My life device is: IF IS GOOD OR BAD, WITH JOY I WILL CARE. silvio Report this Post to the Staff
	Replies: 4 / Views: 790

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