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 Replies: 22 / Views: 3,776 |
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Moderator
 Australia
16849 Posts |
The reverse looks to me to be very similar to Ausjack's coin, here, which I speculated may have been caused by being placed on an extremely hot surface (over 1350 deg C) until it started to melt. If so, his was fried on both sides, yours only on one. Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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Valued Member
 Australia
323 Posts |
Well Sap...I am a potter and I know what would happen if a coin was subjected to that temperature. The whole coin would be affected but this one is still normal on the obverse , so it's not been done by heat. Yes, mine is similar to Ausjack's (centre pic), so I presume they both suffered the same fate, but it's not heat. And as you can see the central part of the coin has not been affected, so its been done by pressure on the outer edge in one hit.
Next please?
Edited by larena
02/05/2012 05:23 am
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Pillar of the Community
Australia
1005 Posts |
Interesting. I will have to look into "thesandpit"s theory some more. I am pretty sure I had one like this and threw it back thinking that it was just PMD... |
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Pillar of the Community
Australia
1607 Posts |
Maybe you should ask thesandpit ( Peter ) if you can send it to him for closer inspection,then you'd know for sure one way or the other & we all might learn something new.
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Formerly nancyc
Australia
5385 Posts |
Normally I would bow down to the opinion of the far more knowledgeable thesandpit, but in this instance I have to disagree. Look at how little wear there is on the Obverse. How can it be a ‘well circulated' anything, with the reverse copping all the wear, and the obv hardly any. There are quite noticeable gouge marks all over the rim on the reverse. If it is so well circulated to cause that much damage to just one side, it is a most unfortunate coin. I still say PMD!  life is a mystery to be lived not a problem to be solved
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Valued Member
Australia
323 Posts |
Aahhaa! just had a thought....could it have been 2 blanks and the top rim has been flattened in the process, which would explain all the flattened rim which has uniform pattern on it
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Pillar of the Community
1119 Posts |
if it was 2 blanks woudnt one side have no markings?
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Valued Member
Australia
323 Posts |
no...it is anchored to the bottom one . ?
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Pillar of the Community
Australia
1005 Posts |
Larena,
Could you explain your idea step by step regarding what you think might have happened during the minting process?
I am having trouble working out what you mean.
If there were 2 blanks stamped at the same time, then each would have one side blank and one side with the design on the coin. I guess it would be very likely that there would be some misallignment between the 2 blanks, and some spreading out of the blank which was not contained in the collar.
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Valued Member
Australia
323 Posts |
what I've read is that they do the rims first....so if 2 blanks went down together into the collar with both rims done, where does the excess metal go on the 2nd (top ) rim when the design is stamped. That's my theory on how the top rim was flattened ..what do you think?
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Pillar of the Community
1119 Posts |
wouldnt the weight of stamping cut of or remove any excess metal on the outside of the planchetts? I tend to think they would but have never seen or studied the process yet
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Pillar of the Community
Australia
1607 Posts |
If I understanding what you are suggesting larena,As was mentioned earlier,if that was the case then there would be no design on one side of each coin,the 2 surfaces facing inward could not possibly have been struck.
What thesandpit said earlier is that it may be a partial collar which means the collar did'nt go down far enough or in this case it would have had to be down too far & when the coin was struck the metal was forced out over the top of the collar & flattened out,no 2nd coin involved.
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Valued Member
Australia
323 Posts |
Well, that makes more sense appleangel107....it certainly does not look like PMD to me. It is too uniform to be that, and the central part of the reverse is quite normal. |
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Bedrock of the Community
Australia
21788 Posts |
If heat was involved as Sap has indicated, it would have been heated to the 'paste range' of copper nickel alloy.
Copper has a melting point of about 1080 deg.C.,
Nickel has a melting point of about 400 deg. C. higher than that, i.e. around 1400 deg. C.
There is not much evidence of black surface oxidation of the alloy, perhaps most of that has been removed.
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Valued Member
Australia
323 Posts |
Sel 691 I'm quite sure this was not done by heat of any kind....I feel it was done while the coin was still in the collar as the obverse has not been damaged in any way
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Replies: 22 / Views: 3,776 |
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Posted 02/05/2012 05:22 am
