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 Replies: 16 / Views: 3,257 |
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Pillar of the Community
Canada
632 Posts |
The core of this twoonie exhibits an odd cut that resembles a metal fold - but metal folds do not occur during the production of the core. To note, this coin was examined by production engineers at the Mint (Ottawa) and they could not offer any answer as to how the error occurred. This coin also circulated in various pubs and shows buit I never got an answer. Weight is normal at 7.32g As expected, core is not magnetic. the ring is normal. An explanation would be greatly appreciated.     Before anyone asks, as all my other twoonies, this coin is not for sale or trade. |
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Pillar of the Community
Canada
2427 Posts |
THe obverse looks as if it may be a "Struck through wire" error!
Is it possible that it was "Struck through" on both sides?
The pictures dont really show the depth. Is the right side of the reverse error lower than the left side of the reverse?
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Rest in Peace
1988 Posts |
t_y....According to my SPM software both haves of the reverse are the same depth, aren't they...?
And the wire struck through is below the Queens picture...?
Edited by wert
07/29/2012 9:16 pm
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Pillar of the Community
 Canada
632 Posts |
Hi.
There is no wire strikethrough. The core is somewhat split. Look at 6:00 edge of the core, obverse, and you will notice that the core is made up of 2 parts. Notice the 2 different tones of the core. The magnifications are somewhat misleading because of the angle the pictures where taken.
The best explanation I can give is - fold a piece of paper making a pleat - if you cut a circle including a part of the pleat, you will see a similar effect as this coin. The point is - the sheet of aluminum-bronze does not fold and there is no superposition of sheets at the cookie cutter.
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Valued Member
Canada
94 Posts |
Close-ups of the obverse at 12 o'clock and 6 o'clock, the reverse at 12 o'clock & about 4 o'clock ... where the core meets the outer ring might prove beneficial...
As it stands ... possibly done after leaving the Mint by an inlay artist...
dts...
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Pillar of the Community
Canada
632 Posts |
the error is not after-mint (and the coin was not even close to Calgary :-)
I will try to post magnifications of the areas you requested - for sure they will not be very good because of the forum size limitations.
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Pillar of the Community
Canada
3692 Posts |
I wish I could see it in hand.
But consider this: Both the core and the ring get struck simultaneously, so it's VERY unlikely that it stops at the core. It really depends on how the core blanks are produced. Without seeing it up close it's hard to tell for sure.
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Pillar of the Community
Canada
632 Posts |
Core and ring planchets are manufactured in separate processes. If the folding was present on both planchets, I would be very suspicious.
... yesterday was BnC night - (beer n coins, plus pizza, single malt, Grappa di Moscato, etc) so I had no time for posting the picture - will do it tonight.
Libertad - are you going to attend the Toronto show in September? I will take the coin there
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Pillar of the Community
Canada
632 Posts |
sorry - I only have a very primitive photo editing software. This is the best I can do: bottom of the obverse  see how the edge of the core folds and sinks only to reappear a few millimeters away |
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Pillar of the Community
Canada
3692 Posts |
@t_y: Are you talking about the one at the reference library? I'm definitely giving that one a shot this year. It's getting a good reputation versus the Torex. I want to unload some unwanted banknotes. Maybe we can trade coins? (Not necessarily your toonie beauty here...) I personally like the Shriners' show a lot whenever I remember when to go.
It would be an interesting science experiment to try to duplicate this as post-mint damage to see how it would be possible to fake this.
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Pillar of the Community
Canada
632 Posts |
Yes, Libertad. See you there!
Will bring a few interesting things to show and tell. See you there!
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Valued Member
Canada
334 Posts |
Going by the pictures , this looks like after mint damage to me .
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Pillar of the Community
Canada
632 Posts |
... and that brings us back to my original post: "an explanation would be greatly appreciated".
Done at the Mint or outside, how 2 sheets of aluminum bronze were folded together, punched as a core and inserted in the ring?
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Valued Member
Canada
94 Posts |
No harm in asking...
Have you tried removing the core from the ring ... so that you can examine same?
dts...
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Pillar of the Community
Canada
632 Posts |
That would destroy the coin.
I want to XRay it but the usual clinical XRay does not give enough resolution (tried).
Something I forgot to tell: you can wedge a sliver of paper along parts of the metal fold - it does not get in very far.
Again - I will be, with this coin (and a couple of other interesting twoonies), in the closest pub during the September show in Tyranto (last weekend). Just ask one of the traditional show dealers "who is the twoonie guy" and they will point me.
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Pillar of the Community
Canada
1581 Posts |
Quote:
Something I forgot to tell: you can wedge a sliver of paper along parts of the metal fold - it does not get in very far.
As I understand it, with the Toonie the core is slightly smaller than the hole in the ring when they are put into the striking chamber. The strike is supposed to expand the core and lock it into the ring. Now, could it be that an irregular core got into the mix, and the strike cause a buckling on the top and bottom? The effect could be quite different on the two surfaces if the core had a larger diameter on the obverse side then the reverse. Exaggerated, a core planchet like: \-------/ .\-----/ Or possibly a not round core planchet? |
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Replies: 16 / Views: 3,257 |
Posted 07/29/2012 4:02 pm
