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 Replies: 21 / Views: 7,044 |
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Pillar of the Community
United States
3644 Posts |
I found this one interesting because it shows what the coin looked like before the roller lines appeared. Don't know what removed the original luster but I will keep this as an example of how these lines are not present when first minted.   |
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Rest in Peace
10197 Posts |
Looks like a rubber scrape, like you thought, something like being put upon a motorized fan belt.  What people will do with too much time on their hands! Unlike US, of course!  Edited by Crazyb0
01/31/2017 11:07 pm
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Pillar of the Community
Canada
891 Posts |
Nice coin, Interesting keeper
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Pillar of the Community
United States
5964 Posts |
I'm going to take a wild stab at this one, Slamn. I have some time on my hands and nothing to lose.
I don't think it's rollers. I think the planchet was made with a partial improper alloy mix. The good mix and bad mix had to meet somewhere.
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Pillar of the Community
 United States
3644 Posts |
Interesting coinmasters. I certainly don't know for sure I just know we find these perfectly straight lines on a lot of the early 80's cents and I've seen coop mention recently how they don't come out of the Mint this way but that the lines appear later when the luster is gone. I know many have said they are not entirely sure where they come from including mike diamonds write up if I remember it correctly that is that he thought they were roller lines tho? I'll have to find that article again but I've never seen one with half the luster still there with no lines which makes coops statement true. I hear what you're saying tho and I've always wanted to know for sure but we may never have a definite answer
Edited by Slamnbass
02/01/2017 01:32 am
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Pillar of the Community
United States
5964 Posts |
I hear ya. It's not known for certain. Some of the things we come across are explained by just best opinions. I know we'd like to deal in just the facts, and for the most part we do. I guess sometimes we just have to go with what's most logical.  |
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Pillar of the Community
United States
5964 Posts |
Mike's had a few write ups, one involved clad coins with the annealing oven, roller marks and discoloration. In my opinion it's improper alloy mix with the coppers. Your 81-D really looks like wood. They're not perfectly straight lines, they're streaks.
Edited by CoinMasters
02/01/2017 02:11 am
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Bedrock of the Community
United States
62064 Posts |
Note that the lines are not on all the obverse? Just there areas where the original finish is missing.   Edited by coop
02/01/2017 2:34 pm
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Pillar of the Community
United States
3463 Posts |
Similar to what Mike said, maybe the rollers or some other part at the mint, left a residue on the coin's surface that affects the metal and later shows up as these lines.
Similar to when a plumber solders Copper pipes together and doesn't rinse all of the flux away. The areas where the flux are corrode very quickly, while the areas next to them don't.
It may be some type of oil or lubricant. It would be interesting to do an experiment with some oil on a Copper cent to see what affect it has over time.
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Pillar of the Community
United States
2563 Posts |
 with Coop. The adhesive blocks out the luster |
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Pillar of the Community
United States
5964 Posts |
In my opinion Slamnbass' cent is the "wider and more variable in width" variety, an improper alloy mix. Here's a pic Mike posted showing a narrow striped clad coin possibly from rollers.  Time moves forward and memory moves back. Edited by CoinMasters
02/01/2017 9:59 pm
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Bedrock of the Community
United States
62064 Posts |
Is the dime missing the clad?
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Pillar of the Community
United States
3656 Posts |
That is really different looking, looks like someone painted the woodie effect on it to. I think it is a great find to see it all in one like that. Super Cool :)
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Pillar of the Community
United States
5964 Posts |
No it's not Coop. It's discolored, a phenomenon on many of the clad Woodys. It's thought to be caused by heat from the annealing oven and under the rollers acting on the lines embedded in the planchets possibly from the rollers. lol It's all a "best guess". It's not known for sure what causes the modern Woodys. It's only a theory that it's roller marks. Cladding can be improperly mixed too. The real question is about the wide and the narrow stripes. Here's a quote from Mike's article: Quote:
conventional improper alloy mix errors are wider and more variable in width. You also never see any lamination errors (cracking, peeling, flaking) in the narrowly striped cents. I believe he's eluding to a theory of wide and variable width stripes being caused by an improper alloy mix and the narrow stripes caused by rollers and heat. As long as we're tossing theories around, here's mine. The improper alloy mix can be caused by an improper combination of elements or an insufficient amount of mixing them. Therefore I think another strong possibility is an under mixed alloy. Anyone that's ever mixed a can of paint knows the swirls (stripes) start out wide, and then get narrower as it gets closer to being fully mixed. I think stripes, especially on alloyed coins are from insufficiently mixed alloys. The narrower striped ones don't crack, peel, and flake because they are better mixed. Mike and I discussed this about a year after the article in Coin World was published and neither theory was ruled out. That article is dated 30 Sept 2014, he has revised his thinking on the possible cause of the possible roller marks since then. It is pretty much as I have stated here-in. |
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Pillar of the Community
United States
5964 Posts |
One other thing, and then I'm signing off. If you look at a small part of a large circle, it appears straight. A small cent is not very big, and hardly a gauge as to whether the lines are perfectly straight or curved. Roller marks (if they exist) would have to be straight and even. Slamnbass' cent is wide with variable widths and swirled. lol I think everyone that sees it should agree it's one pretty penny.  |
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Bedrock of the Community
United States
62064 Posts |
So to us, (Mike and Me) they are not a planchet issue from a poorly mixed base metal. If is more of a production issue, not an improper mix issue. The differences are quite different in our eyes.
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Replies: 21 / Views: 7,044 |
Posted 02/01/2017 12:42 am
