| Author |
 Replies: 13 / Views: 2,538 |
|
|
Pillar of the Community
Canada
737 Posts |
|
|
|
|
New Member
Canada
34 Posts |
Looks like PMD. My reasoning - the coin looks well struck in the area of missing chrome/nickel, but raised elements appear smaller than normal size. For example, look at the rim beads - smaller than the rim beads in the nickel area. This is because when the nickel was removed from the beads, the remaining metal bead is physically smaller. If the nickel had been missing from the planchet before striking, the beads should have struck up to full or near full size. Should note, the above is before we consider the nature of the planchet, which is a nickel/copper/nickel plating over a steel core. Edited by RidgeWest
05/21/2016 10:26 pm
|
|
Valued Member
Canada
56 Posts |
The thing that I find weird about this coin is that the chrome still seems to be on all the high point of the coin. Is this correct TaeKenDo. Don't know if the pressure of striking would make it stick better or not. Also if I understand plating properly would this coin be half out of the solution or something on the coin while plating for the chrome not to stick.
Very nice coin either way TaeKenDo.
|
|
Pillar of the Community
 Canada
737 Posts |
PMD... how the heck do you get the plating off a coin...? It`s flaked off though, not melted off or something. Maybe send it somewhere to be verified, I`m curious. Love all this weird stuff about coins.
|
|
New Member
Canada
34 Posts |
For clarity, I said nickel loss appears to have happened subsequent to minting. How or why the plating came off I do not know. I do know that the RCM marketing and production people would be disappointed if it happened unassisted. They are quite proud of their patented multi-ply plating process. |
|
Pillar of the Community
Canada
2519 Posts |
It's easy to electrolyse the plating off these coins. I did it last time, layer by layer until I saw the steel core. I can't get the devices to keep looking intact once the outermost nickel layer is off, but mine wasn't really done in a scientific way.
Also, are you sure it's not just a stain? The devices look intact and I've come across a lot of dirty and stained MPPS coins having that dark colour.
|
|
Moderator
 Canada
10460 Posts |
Quote:
PMD... how the heck do you get the plating off a coin...? Quite easy... an electrical current and basic knowledge of chemistry... "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
|
|
Moderator
Canada
10460 Posts |
I am pleased to see folks interested in errors, but to help a bit - try to think of situations like this in a reverse engineering mindset...
If this was a planchet error, prior to the strike, how do you explain the rim appearing to be plated, while the fields are not? The planchet is electroplated after its creation, and plated in three layers (thin nickel, thick copper and thick nickel). The rim is then created through two phases (Type 1 to Type 2 rimming) and the collar die during the strike - both of those rimming factors are independent of any planchet type...
This is post-mint damage, so try and imagine the various things that could do this to a coin, versus the coin production process and draw your own conclusions...
"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
|
|
Pillar of the Community
Canada
737 Posts |
I have 2 more found in my pocket change at different times that look like the plating is completely gone. One even from both sides. Don`t think it`s a dirty but it^`s very dull grayish color like in these pics. Have a few nickels like this as well, one from the 40`s UNC but dull. It`s in super shape though. I`ll try to add it here or in a new post when I take a picture.
|
|
Pillar of the Community
Canada
737 Posts |
I just thought of how it could have happened...lol See that sort of darkish spot around the date ? I have a suspicion that someone hit this coin with the tip of a welding rod (arc welder) or it had some kind of electrical charge (and burn) done to it which could have lifted the plating... maybe.
Edited by TaeKenDo
05/22/2016 02:22 am
|
|
Valued Member
Canada
458 Posts |
interesting I have some pennies that appear to have some of the copper plating missing
|
|
Pillar of the Community
Canada
2784 Posts |
TaeKenDo make sure your coin is magnetic. because so times when plating dont stick. the metal it is being applied to is not steel. make sure you weight your coin. check it with a magnet. then you will know it is steel. see it might be some foreign metal. check every possibility. that way you know for sure
|
|
Pillar of the Community
Canada
737 Posts |
Thanks, yes magnetic & exactly 4.5 grams. Also have a 2012 Magnetic 1 cent, no plating whatsoever at exactly 2.4 grams The cent is a grayish color but looks like it`s flaking in a couple of tiny places & I can see copper color beneath. Don`t know what to make of this...
|
|
Pillar of the Community
Canada
737 Posts |
Thanks for the tip rocky about the reason the metal won`t stick (being non-magnetic) simple but I never thought about that.
|
| |
Replies: 13 / Views: 2,538 |
|
Posted 05/21/2016 10:12 pm
