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 Replies: 41 / Views: 6,925 |
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Pillar of the Community
 Canada
9865 Posts |
I'm curious.
What is an incomplete proof coin?
Perhaps you can start another thread to explain this.
"Dipping" is not considered cleaning...
-from PCGS website
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Pillar of the Community
 Canada
6244 Posts |
Thanks Rocky, so exist those errors. I am glad to know someone know about. I will slab and wrote "Incomplete proof strike" year 2006 - 2011
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Pillar of the Community
Canada
9865 Posts |
Are you kidding?
"Dipping" is not considered cleaning...
-from PCGS website
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Pillar of the Community
Canada
6244 Posts |
@DBM I agree with you of opening a threat for this. Rocky open in my mind a new point of view to explore.
Maybe those coins, like this one is part of striking proofs adjustments.
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Moderator
 Canada
10460 Posts |
silviosi - you still didn't answer the question. What do you consider to be " normal parameters" on a multi-ply plated 25c coin?
Secondly, with only a 15W beam source, obtaining consistent values would be impossible, portions of the beam would be attenuated with each plating layer, unless you only get Ni and Cu values. In Mining and Minerals modes, you must have upper detection limits which you would flood testing a pure alloy, no?
I use a 50W beam source with my instrument, in "alloy" mode software, and Fe values are still all over the place. Impossible to establish "normal parameters".
"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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Moderator
Canada
10460 Posts |
Quote:
Maybe those coins, like this one is part of striking proofs adjustments You are joking... right? You just said this was a coin of normal composition. Why on earth would you then jump to a conclusion that makes absolutely no sense?  There is absolutely nothing "proof" about this coin. ALL modern plated multi-ply planchets are burnished before striking. That is why they look so shiny when fresh out of rolls. There are a few CN Journal articles out there that describe this process. Proof coins are struck on silver planchets in Ottawa. This would be a coin struck on a normal planchet from the Winnipeg plant. It is like a die set-up strike, nothing more. Still desirable, and worth about $75 to $100 in my opinion. "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
6244 Posts |
Quote:
Why on earth would you then jump to a conclusion that makes absolutely no sense? Congrats, very nice and deep thinking. I like  . I just thinking, not a final conclusion. I know better the mint lines in US and Germany then the newest Canadian 's. Probable same kind. Back to the XRF.: The high-resolution silicon drift detector (SDD30) combinate with the high power of 3mA 15 Watt ceramic window is proved that is more performant then the bench EDXRF 50 Watt. I recognize that never I take the results at 100% accurate, but on multiply coins give me something like 97.5 to 99.2% (the best) accurate composition (this I considered in parameters, maybe is a wrong perception). This XRF permitted me to go for samples till 8mm thickness by 20 mm diameter. The value of the coin is nothing for me. You want? I give you in exchange of two Vicky reddish colour. |
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Pillar of the Community
Canada
9865 Posts |
Quote:
Proof coins are struck on silver planchets in Ottawa. Since 2012 there have been alloy as well as silver proof coins. So I'm still eager to hear the explanation for "incomplete proof strikes". "Dipping" is not considered cleaning...
-from PCGS website
Edited by DBM
03/27/2021 01:17 am
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Pillar of the Community
Canada
6244 Posts |
@DBM and all others: Some one must open the threat for this because from this coin we get in three different treats. the coin, me and SPP on XRF and now the "incomplete strike"
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Pillar of the Community
Canada
2301 Posts |
I am leaning to plated. I do not believe it to be a die adjustment strike. Value 25 cents.
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Pillar of the Community
Canada
6244 Posts |
nickelguy, no contradiction on. Could be just plated. the specs of the coin I give and those are here. The idea of adjustment is very plausible one. Why? In the process of calibration for proof strike, they program the machine for max 4 strikes. The normal circulation coin is strike ones at 80 tones forces. For PROOF they strike till 4 times, so the strike will go progressive from what I know 40 tones strike to 90 tones strike. Like this the Proof coins are made. If you do not go progressive on strike an the temperature of the material is not optimal you will never have to day this almost prefect proof quality.
Edited by silviosi
03/27/2021 07:49 am
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Pillar of the Community
Canada
2301 Posts |
For the collar die to be filled the rest of the coin must be fully struck or close to it. A weak strike must affect all 3 dies....
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Pillar of the Community
Canada
6244 Posts |
Oh, yes and no. I have somewhere here the strike video (for us proof, Canada must be same). The strike is consecutive without collar moving. The laser technology permit to drive those strikes. In fact is only one die (hammer and anvil) who strike progressive 4 times.
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Moderator
Canada
10460 Posts |
Quote:
For the collar die to be filled the rest of the coin must be fully struck or close to it. A weak strike must affect all 3 dies.... Normally, I agree. But these newer presses are completely different animals. I have something similar with a plated 1c, but full rim. My contact at the Winnipeg RCM plant also confirmed it.  "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
6244 Posts |
SPP I agree with you when you say those big animals, waw they are something I saw them in Phill.
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Replies: 41 / Views: 6,925 |
First Page
Posted 03/26/2021 10:38 pm
