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 Replies: 15 / Views: 2,133 |
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Pillar of the Community
Canada
737 Posts |
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Pillar of the Community
Canada
2519 Posts |
Sorry but it appears to be sanded down. Can you get a weight?
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Pillar of the Community
 Canada
737 Posts |
It comes in at 4.7 grams. I weighed a 2003 and it is 4.5 grams. So it is a little heavier actually.
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Pillar of the Community
Canada
737 Posts |
If metal is removed when the ridges are formed, maybe that would account for the higher weight since the ridges aren't deep at all.
Edited by TaeKenDo
05/19/2015 11:23 am
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Pillar of the Community
Canada
2519 Posts |
Quarters post-2000 are made of Multi-ply Plated Steel and they are lighter than the solid nickel ones.
These solid nickel quarters should weigh 5.07 grams, so yours is only a little over half the weight it should be. Some metal was removed post-mint.
Edited by Altaira
05/19/2015 11:26 am
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Pillar of the Community
Canada
737 Posts |
I'm sure you're right, I'm just being the devil's advocate.
Or it was from a thinner planchet & rejected after the reverse was done. I agree it's possible it's been modified but if the all the obv. details were removed to this point, the quarter would lose a lot more than that in weight and it would be much thinner I think. The difference between the two is less than the rim height.
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Pillar of the Community
Canada
737 Posts |
I'm also thinking that it's probably fair to say you could split up a coin into 3 layers about equal. The Obv, the Rev. and in between. So if the Obv. was sanded down, you would lose 1/3 of the weight. The 1990's quarters were 5.05 grams according the Charlton's 9th ed. so if you do the math. 5.05/3 it should weigh in at 3.36 gr instead of 4.7 gr. Maybe I overlooked something but coins have been struck on thinner planchets before no?
Edited by TaeKenDo
05/19/2015 7:23 pm
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Pillar of the Community
Canada
3049 Posts |
I don't think your math is correct on that one TaeKenDo. If I were to remove the details from the obverse or reverse I don't think it would be equal to 1/3 of the total mass of the coin.
You have now given me some inspiration to my next experiment however.. to prove this hypothesis correct. I'm off to find my digital scale!
There is a discussion about another coin (I think it's a penny) that has similar attributes... details and a rim on one side and blank on the other.
SPP wanted to see the coin in hand...
Now from the pictures you've provided .. on the blank side it does look like there's some sort of impression right in the middle of the coin. There also seems to be some sort of concentric rings on the blank side. To me if what I'm seeing is actually there and correct I would believe this coin to have been "machined" like on a lathe of some sort.
That's only my guess and opinion ... and I am nothing close to an expert, so take it for what it's worth!
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Pillar of the Community
Canada
737 Posts |
I see what you mean. There are raised marks on the blank side, a little bit everywhere. I'm thinking possibly die clashes. I was a machinist growing up and I can tell you that if this was turned on a lathe, you couldn't undo what you have removed and put it back as raised lines in different directions and in different places. There are scratches all over it but are random, not circular. I think what you are referring to might be the mark made from the impression of the Rev. There is also a very slight raised rim. What a mystery. Great conversation piece...
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Pillar of the Community
Canada
737 Posts |
I guess an easy test for my 1/3 theory is with a micrometer on both fields of a regular quarter and then subtracted from the thickness of the same coin at the edge or rim.
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Pillar of the Community
Canada
2519 Posts |
I just noticed that in the last pic the coin seems to have a slightly snaller diameter compared to the other normal quarter. Is it really like that or is it just because of the pic? Asking because the reeding seems to be gone too.
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Pillar of the Community
Canada
737 Posts |
Yes you're right, I measured the thickness with a digital caliper and the coin is .06mm smaller (about 1/2 the .11 thickness of a sheet of paper I measured). I also measured the double thickness of the plastic from a cardboard coin holder and it comes in at .04 mm. I think that difference is negligible since the reeds must measure an easy .2 mm doubled up and almost completely removed like that would bring the difference to about .25mm or 4 times the difference it is now.
The other thing is that as the metal is removed making the reeds, if I'm not mistaken, the metal on each side of the grooves cut would rise slightly therefore the overall diameter of the coin would increase. Since the reeds don't look like the were completed, the diameter of the coin has not increased.
Don't get me wrong, I argue all this with a lot of skepticism because I really would like to get to the bottom of it. I just don't want to rule out anything which makes for a more precise judgement call.
Thanks for your input because it's taking me through the process of elimination. Now all I have to do is go to the Mint & say "What the heck is This?"
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Pillar of the Community
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2425 Posts |
Lets take a look at 4:00 and 8:00 O'clock on the second picture. Possibly a quarter machined out and a round metal blank was pressed into the cavity.
Any thoughts?
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Pillar of the Community
Canada
1461 Posts |
DD. That's what it looks like to me. There would be no gaps as seen in a ground down piece. The other possibility is that the original ground out quarter is inserted into another ring. A better picture of the reverse would probably show that.
Edited by TheCoinHunter
05/19/2015 7:33 pm
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Pillar of the Community
Canada
737 Posts |
I made a typo earlier when I said the coin weighed 4.07 and I corrected it the post. It weighs 4.7 gr not 4.07 gr. So the difference in weight is .37 gr or about 7% If the obv & the reed metal adds up to only 7% of the coin then it would be modified. If it's 20+ % then it is a lot heavier than it should be with that much metal removed.
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Pillar of the Community
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737 Posts |
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Replies: 15 / Views: 2,133 |
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Posted 05/19/2015 11:20 am
