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 Replies: 11 / Views: 950 |
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Pillar of the Community
United States
985 Posts |
Edited by killians76
11/18/2008 10:00 pm
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Valued Member
United States
322 Posts |
Hi. Looks like die scratches, resulting in raised scratches/lines on the coin.
Mike
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Pillar of the Community
United States
5318 Posts |
Wow, those are some interesting marks!  I've seen polish lines on LMCs before, but those don't look made by a tool suited to polishing.  I hope you don't mind--I've added a detail of one of your closeups below for a quick view--great photos!  |
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Pillar of the Community
 United States
985 Posts |
Nope don't mind at all KurtS, looks even deeper at the start of the marks thogh doesn't it? The whole side is like that, but those are the most noticeable. Looks to me like he tried to polish it with a broken file..lol
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Rest in Peace
United States
1943 Posts |
I don't think files are used to polish dies. I think the dies are harder than a file. Probably stones are used with lapping compound. Stones come in different grades for faster removal of material and slower removal leaving a better finish. Also lapping compounds come can be different. I don't know what happened with this coin but I would guess someone at the mint polished this die either using the wrong stone/compound or started to polish it forgetting to finish it with the fine stone. If this turns out to be heavy die polishing marks then this is my wild guess as to how it happened. This is an interesting coin and great pictures. I'll be curious to hear what the experts say.
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Pillar of the Community
Spain
1361 Posts |
looks like die scraches or is it the planchet?
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Pillar of the Community
United States
2540 Posts |
Die polishing lines.
Possibly a first strike/ early strike after the job was done.
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Pillar of the Community
United States
2254 Posts |
Stupid question, but why would the lines stop at the letters and not show there as well if it was polishing? Is it because the letters are incuse on the die and the polishing didn't go that "deep"?
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Bedrock of the Community
United States
12437 Posts |
Quote:
Is it because the letters are incuse on the die and the polishing didn't go that "deep"?
Yep, you answered your own question  When it does go too deep, you get things like 3 legged Buffalo nickels. |
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Pillar of the Community
United States
1219 Posts |
Your thinking is correct tights. The surface of the die is flat. Lettering, date digits and Lincolns profile are incuse on the die. The polishing tools simply pass over these incuse areas. That why clash marks show up mainly in the fields on most coins. Although sometimes they can be found on the relief areas. This coin shows a quick attempt to remove clashes and get the die back in service.
Sometimes I'm a little lon winded or I'd of beat ya bio.
Edited by MorgansRmine
11/19/2008 10:40 am
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Pillar of the Community
United States
5318 Posts |
Quote:
Stones come in different grades for faster removal of material and slower removal leaving a better finish. Also lapping compounds come can be different. That's interesting. If the lapping compound used corundum dust (aluminum oxide) and a few larger grains were caught under a stone, they just might leave those defined scratches. That material would easily cut into the hardest steel, and diamond dust with a few grains would be even more pronounced. Cool coin--whatever happened. |
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Bedrock of the Community
United States
17884 Posts |
Yep, die "polishing" with a coarse stone. These are actually pretty common.
Die can be polished with a lag of various grades, but they also have a"stone on a stick" for getting in there and "polishing" out a localized mark. That leaves the coarse linear marks that tend to be in groups but each group running a different direction.
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Replies: 11 / Views: 950 |
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Posted 11/19/2008 03:30 am
