1990 Cent Doubling - Coin Community Forum

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Author	Replies: 9 / Views: 1,215
jessvc1 Pillar of the Community United States 2596 Posts	Posted 10/09/2011 3:03 pm Here is what looks like a RPM on a 1990 cent I just found from pocket change, I havent really studied alot of the newer coins so is this quiet common on the newer coins? Edited by jessvc1 10/09/2011 3:15 pm Report this Post to the Staff

jessvc1 Pillar of the Community United States 2596 Posts	Posted 10/09/2011 3:06 pm Report this Post to the Staff
rickmp Valued Member United States 64 Posts	Posted 10/09/2011 3:07 pm Can't happen! Mint marks are no longer hand punched into the dies, they are now added to the master dies. What you have is Machine Doubling. Edited by rickmp 10/09/2011 3:10 pm Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 10/09/2011 4:44 pm Last year for RPMs on Lincoln cents was 1989, all mintmarks were on the master dies starting in 1990. Report this Post to the Staff
matthewpj73 Valued Member United States 187 Posts	Posted 10/10/2011 01:30 am Definitely not a rpm...rikmp is correct this is Machine Doubling. Report this Post to the Staff
unholyroller Pillar of the Community United States 1903 Posts	Posted 10/10/2011 01:49 am Why if it is Machine Doubling is only the D doubled? You would think the 1990 right next to it would have traces of it as well. Seems odd to me only the D would show this and not the date. I can't see how one detail can be misalligned to show Machine Doubling but everything else is ok. Report this Post to the Staff
Maineman750 Pillar of the Community United States 3592 Posts	Posted 10/10/2011 07:41 am Machine Doubling can be isolated like that. I've never seen a good explanation other than one device might be slightly taller and that is what the die clipped on the bounce. Report this Post to the Staff
Changeless Valued Member 273 Posts	Posted 10/10/2011 12:18 pm I think Maineman750 hit the nail. At the extreme pressures and and very high speeds of a coin press (as I have read), intesting things happen. Next... this is off topic... but does anyone know how much a coin heats up when it gets whacked by the press? (I must have too much time on my hands... to be asking a question like that. But it IS a holiday.) Report this Post to the Staff
matthewpj73 Valued Member United States 187 Posts	Posted 10/10/2011 3:59 pm Changeless, I was actually thinking the same thing today, about the pressures/temperatures that the coins undergo during the minting process. I imagine that it varies from metal to metal, with softer metals heating up more and becoming possibly "fluid" for a fraction of a second....yep, it's a holiday. Like the old Styx song...Too much time on my hands. Report this Post to the Staff
coppercoins Pillar of the Community United States 7629 Posts	Posted 10/10/2011 11:00 pm The reason why only the mintmark is affected is pretty much what others have stated - because the mintmark has edges that are at a sharper angle than most of the other devices, they tend to get stuck up in the dies easier. Report this Post to the Staff
	Replies: 9 / Views: 1,215

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