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Moderator
 Canada
10458 Posts |
Guess the monarch... there is a way to know which series this planchet was made for, but it will require a bit of searching to understand why... (and I didn't use the XRF to figure this out). This is a very cool Canadian blank planchet. Coin is currently in a NGC slab, correctly identified by monarch.  "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
Edited by SPP-Ottawa
07/20/2013 9:20 pm
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Valued Member
United Arab Emirates
283 Posts |
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Pillar of the Community
United States
4897 Posts |
Does identification have to do with the upset rims?
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Pillar of the Community
Canada
1177 Posts |
did NGC assign a numerical grade?
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Pillar of the Community
Canada
519 Posts |
If it weighs 4.54g then it is Queen Victoria. I don't think that's it though because just the weight wouldn't help with 1876-1920 and your post indicates you can attribute each blank planchet to a particular monarch. Can this only be done with a Type II blank planchet? Is there an identifiable feature about the rim/edge?
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Pillar of the Community
Canada
785 Posts |
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Bedrock of the Community
Australia
21788 Posts |
Can XRF, (THROUGH THE SLAB), be used to identify the proportional relationship of the trace metals in the planchet?
If this can be known, a comparison metal study can be completed with known circulation coins for date.
Fortunately, I have easy, but indirect, access to XRF. My next door neighbour is a pHd practicing materials forensic scientist.
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Pillar of the Community
 Canada
9865 Posts |
Can't be Victoria or early Edward because it wouldn't be discernible from a British halfpenny.So it must be 1908 or later.
"Dipping" is not considered cleaning...
-from PCGS website
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Pillar of the Community
Canada
519 Posts |
Large cents were struck on British Halfpenny planchets from 1876-1920 right? The planchets should be roughly all the same in terms of diameter, weight and composition. There must have been some kind of a re-tooling process between monarchs and they changed the upsetting machine also. That's my guess anyways.
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Moderator
 Canada
10458 Posts |
Quote:
Can't be Victoria or early Edward because it wouldn't be discernible from a British halfpenny.So it must be 1908 or later. Not so fast... British half-pennies are 5.2 grams, Canadian large cents are 5.67 grams... this coin is 5.6 grams (weighed to one decimal place). "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Pillar of the Community
Canada
9865 Posts |
Quote:
British half-pennies are 5.2 grams, Canadian large cents are 5.67 grams... this coin is 5.6 grams (weighed to one decimal place). Slow down a minute.. The halfpennies were made to the same specifications as our large cents.One inch in diameter and eighty to the pound. "Dipping" is not considered cleaning...
-from PCGS website
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Moderator
Canada
10458 Posts |
Try weighing some...
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Pillar of the Community
Canada
9865 Posts |
Doesn't matter what they actually weigh.What matters is what they are supposed to weigh.A planchet weighing 5.6 grams cannot be ruled out as a halfpenny.
"Dipping" is not considered cleaning...
-from PCGS website
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Pillar of the Community
Canada
9865 Posts |
I agree with o-train,somewhere along the way the rimming process was changed,but I get the feeling it was before the end of Victoria's reign.
"Dipping" is not considered cleaning...
-from PCGS website
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Pillar of the Community
Canada
519 Posts |
So what's the verdict? I'm still curious about this.
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Moderator
Canada
10458 Posts |
1. Victorian planchets did not go through the upsetting mill to form type 2 planchets. You can see that with some of the Victorian large cent errors of the day. When this change occurred is still a bit of a mystery to me. I would probably have to walk in Rob Turner's footsteps and look at the original mint reports. I have a 1900H clipped large cent, without any evidence of a Blakesley Effect... 2. Edward planchets did go through an upsetting mill, as seen in the Blakesley Effect of my 1903 straight clip: https://goccf.com/t/143425Planchet is 5.67 grams, which is consistent with Edward VII Canadian planchets. I understand what the weights were supposed to be, but it is pretty consistent to have British halfpennies weight 5.2 to 5.3 grams and Canadian large cents to weigh 5.6 to 5.7 grams. I have not weighed enough to have 95% confidence interval, but if I did, I suspect the statistics are valid. Coin was originally from England, and submitted to NGC. Heaton and Royal Mints stopped producing Canadian coins after 1907, so it would have to be a miracle if it was a George VI large cent planchet, from Ottawa. Therefore, it is a Edwardian blank planchet. ----------------------------- This planchet was in my collection, until this past weekend. A good friend of mine, who has a world-class Canadian planchet collection, begged me for it and I relented. The timing is good. I am focussing my collection more on small cents, and will be selling off my large cent errors and varieties. A good friend has already purchased my 1881H Single Serif N. I suspect Zonad and I will be making trades for my large cent errors. Watch my ebay store for the rest, as time permits me... "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
Edited by SPP-Ottawa
07/23/2013 3:13 pm
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Replies: 20 / Views: 4,858 |
Posted 07/20/2013 9:38 pm
