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 Replies: 19 / Views: 3,112 |
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Valued Member
Canada
306 Posts |
Hello I need your help to identify how this defect occurs and thank you in advance for your help. This piece come from a box of 5 ¢ 2016 roll, bought directly from the RCM by a friend collector.  You can see this hem on the side of the obverse that is actually on the side of the anvil die, which is encircled by the wall of the collar die. On this picture you have the length of the hem (arrow red) and the thickness.  Question: How can he have this hem, when it is known that the anvil die is surrounded by the wall of the collar die? I also put a photo of the reverse.  The marks that are seen on the rim come from after the strike as I think, and probably when handling to the RCM. |
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Pillar of the Community
Canada
693 Posts |
I'm not sure what caused the "hem", but really nice photos! Awesome job.
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Pillar of the Community
Canada
1221 Posts |
Castor, this looks interesting to me also and I was hoping someone would give you an answer.
Can I assume the weight is correct?
When you blow up your pictures the rim damage it doesn't look like it's been scrapped in. Look where the damage goes into the field near the beads which appear to be undisturbed.
Could it not have been on this portion of the blank before the strike?
Maybe something went wrong when going through the upset machine?
Cheers, Bill
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Valued Member
 Canada
306 Posts |
Hello Hounddog Bill
I also hope that an expert will find time to explain this hem.
Because this hem is on the side of the anvil die and it looks like a partial collar for the part shown in the picture.
The weight is ok.
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Pillar of the Community
Canada
5324 Posts |
How about something simple like a flawed planchet
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Valued Member
Canada
306 Posts |
Hello john100
So, how to explain that a flawed planchet creates a hem on the side of the andvil die?
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Moderator
 Canada
10456 Posts |
Are you able to take another photo of the rim, from a different angle? I would like to see the top of the obverse without arrows and lines drawn in it... The modern coin presses in Winnipeg still operate with the hammer die coming down on the anvil die, but the collar die mechanism has evolved over the years. What I think I see is a fully struck coin, but partially in collar.  "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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Valued Member
Canada
306 Posts |
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Pillar of the Community
Canada
2425 Posts |
I was thinking the same thing SPP but I do think more pictures or a "In Hand" view would be better.
A possible Red Flag I see is damage on the top of the coin on both the obverse and reverse which coincidentally is where the so called error is.
Just my opinion.
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Pillar of the Community
Canada
5324 Posts |
Thinned bevel planchet from the edge of the rolled stock maybe?
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Pillar of the Community
United States
2589 Posts |
Looks like a partial collar error, we find them here occasionally in the USA on our own nickels.
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Pillar of the Community
Australia
7096 Posts |
I don't believe that I have ever seen a partial collar error quite like this one.  Usually there is a raised portion on the edge of the coin and not a groove like this coin has. The damage on both the reverse and obverse of the coin that corresponds to the groove may be the "Key" to solving this mystery  |
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Pillar of the Community
 Canada
9863 Posts |
Partial collar.
"Dipping" is not considered cleaning...
-from PCGS website
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Moderator
Canada
10456 Posts |
Looks like it could be a partial collar strike, on a Type 1 planchet (the planchet bypassed the upset mill). The medial groove looks like it could be from the shearing of the planchets being punched (which is removed when the Type 1 planchets are milled into Type II planchets). There was still enough metal to form the rims, but only partially in collar.
I have some 1-cent coins from the 1980s strike partially in collar on a Type 1 planchet, which have a similar look to them...
What is the weight of the coin? Another alternative is that it could it have been struck on a slightly larger or thicker foreign planchet?
"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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Valued Member
Canada
306 Posts |
Quote:
SPP-Ottawa
What is the weight of the coin?
3.9 Gr.
Hello and thank you all for your comments. I put my question back at the beginning because I think it seems to be misunderstood. Quote:
Castor wrote:
Question:
How can he have this hem, when it is known that the anvil die is surrounded by the wall of the collar die? Unlike the USA, in Canada the anvil die is always the obverse and the hammer die is always the reverse. For the hem on the piece which I present, it must be understood that it is on the side of the anvil die, or observe. When we see a partial collar, it is on the reverse side and not on the side of the observe. As many speak of partial collar, which is normally of the reverse side, I thought it good to make this drawing so that all place well the place of this defect. This hem being of the side of the anvil, how this hem could be formed as the metal is stopped by the wall of the collar die? There is the question!  |
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Moderator
Canada
10456 Posts |
Quote:
When we see a partial collar, it is on the reverse side and not on the side of the observe. This is not a true statement, I have seen both. Think of how anvil die caps are formed... The collar die encloses around the coin, the planchet does not rest against it before the strike. This is especially true with the newer presses in Winnipeg. "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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Replies: 19 / Views: 3,112 |
Posted 02/23/2017 12:31 pm
