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 Replies: 20 / Views: 3,520 |
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Valued Member
United States
91 Posts |
1987 LMC Pocket Change Looking to increase my knowledge on why and how this happens. I have seen it before but not often (more often then a DD or RPM) but not as often as MD. I want to take a stab at this but after trying to write out what I was thinking it didn't make much sense. You don't need to know how dumb I am yet - we have years for you to figure that out.  What I see is like a gouge above the words "we trust" and then raised metal above each letter the same shape as the letter tops in that same gouge. Just curious    Peace Brent Edited by Brent Williams
04/27/2010 11:17 am
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Pillar of the Community
United States
2600 Posts |
Brent, I believe what you are seeing is plate flow. when it happens, it flows outward toward the rim. As here, there is buildup as the rim blocks the continued flow. If severe enough, the plating will crack and the Zinc will show just above the devises. The areas just above the "T"s in trust seem to be very subject to this. This is how I understand it, anyway.
Jim
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Valued Member
United States
105 Posts |
Interesting. I see alot of these coins too and always wondered what it was. I'm still new so could some one fill me in on what RPM and MD stand for? I know DD is double die. Thanks
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Valued Member
United States
105 Posts |
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Valued Member
 United States
91 Posts |
Yes - my bad - LMC is what it should be - Thanks for catching that Peace Brent |
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Moderator
 United States
56855 Posts |
Quote:
Interesting. I see alot of these coins too and always wondered what it was. I'm still new so could some one fill me in on what RPM and MD stand for? I know DD is double die. RPM=Re punched Mint Mark,MD=Machine Doubling,DD=Doubled Die (not double die). Hope this helps. John1  |
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Pillar of the Community
United States
1882 Posts |
I thought that was an indication that the die was getting worn out...there is some Die Deterioration Doubling on the right side of the numbers in the date, too. |
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Valued Member
United States
91 Posts |
Quote:I thought that was an indication that the die was getting worn out...there is some Die Deterioration Doubling on the right side of the numbers in the date, too. Let me see if I can get a good picture of the date. Thanks  |
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Pillar of the Community
United States
1882 Posts |
See the faint doubling around the numbers and mint mark? It almost looks like a reflection. Die Deterioration is the cause. Someone throw me out at first if I'm off base. Edited by steve199
04/27/2010 12:03 pm
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Valued Member
United States
91 Posts |
I wish I could get my s**t together today  - that is the wrong dated coin - let me retry. I should have stayed in bed.  Peace Brent |
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Pillar of the Community
United States
1882 Posts |
I didn't even notice that was a different coin. The 1987 still has the effect on the right side of the numbers, although it is more subtle. |
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Pillar of the Community
United States
4000 Posts |
As I understand it, I have to agree with Steve, I believe it is just a worn out die.
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Bedrock of the Community
United States
62064 Posts |
The mark on the outside edge is where the plating was split during the strike. A some time the area starts raising as the zinc is exposed.
The mark under the mint mark is caused by a rough edge when the die was punched making a fin on the die. After several coins are struck it eventually flattens down in time.
The die isn't worn on this coin. The striking pressure pushes the planchet and makes this appear.
So just a normal coin.
Edited by coop
04/28/2010 09:58 am
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Valued Member
United States
91 Posts |
Thanks all. I new it wasn't anything spiecial, just wanted to understand why it happens. I have a beter understanding now.
Thanks again
Brent
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Pillar of the Community
United States
4000 Posts |
I'm not sure if I'm following you, coop.
What do you mean by the striking pressure pushes the planchet?
I understand the plating splits during the strike, but does it leave the mint looking like the coin above? Or does it leave with just the split plating and begin to raise after time?
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Bedrock of the Community
United States
62064 Posts |
Scooby: I miss read a post back a few days. https://goccf.com/t/63749&whichpage=1The mottling is what I miss read. On the coin example you see the shadowed doubling, but on the last digit of the date there is none. I need to find a couple of examples from the same roll to see if it happens once (mottling) or repeated from die wear. I don't have examples to examine now, but I will be watching for some. |
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Replies: 20 / Views: 3,520 |
Posted 04/27/2010 10:27 am
