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Replies: 12 / Views: 6,816 |
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Valued Member
United States
158 Posts |
Edited by buggs 07/04/2011 5:22 pm
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Valued Member
 United States
158 Posts |
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Rest in Peace
United States
1943 Posts |
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Moderator
 United States
56855 Posts |
If your talking about the MM it's MD and very common. John1 
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Valued Member
 United States
158 Posts |
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Valued Member
 United States
158 Posts |
I have spent hours here in the background reading and looking at pics to gain knowledge. But now I'm a little confused about RPM or PMD. They look very similar but what is a sure fire difference that I'm missing?
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Rest in Peace
United States
1943 Posts |
After I posted I considered MD. The only thing I couldn't grasp about it is in such a small area as the mintmark, how can it damage the right outside edge of the "D" without also damaging the right inside loop of the "D". But John is better with varieties than I am and I trust his judgement more than mine. Buggs, PMD (Post Mint Damage) is just some form of damage after it left the mint. I think what you are possibly getting confused about is RPM vs MD. Machine Doubling is damage caused by a variety of possible problems and in this case I think John was specifically thinking of Strike Doubling which is typically caused by a loose die. The die can then move while still being in contact with the coin and will cause damage such as what you see on your mintmark. One characteristic of this damage is the devise which is your D will not look completely formed at the area in question. Notice how the right side of your D is thinner than it should be? An RPM would produce a partial secondary image of a D to the right of a normal sized D.
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Valued Member
United States
262 Posts |
what would this be caused from, grease?
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Bedrock of the Community
United States
62064 Posts |
From die movement during the strike. Often the mint mark is higher than the other devices and get damaged after/during the strike. The damage is flat shelf like and a RPM is rounded and enlarges the devices. 
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Valued Member
 United States
158 Posts |
I know this sounds like a basic question too allot of others but I'm in training. So I can understand, the mint mark was struck once then again to the west?
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Bedrock of the Community
United States
12437 Posts |
No, the 1962 quarter was struck once but there was slight movement of the die during striking which caused the Machine Doubling.
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Valued Member
 United States
158 Posts |
Thanks biokemist6 fo rthe reply
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Valued Member
 United States
158 Posts |
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Replies: 12 / Views: 6,816 |
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