| Author |
 Replies: 22 / Views: 5,013 |
Page 2 of 2
|
|
|
|
Pillar of the Community
1119 Posts |
red oxide coating of some sort?
and scratch ,arks on the obverse between the date and shoulder, testing to see if it took? they sure do appear to be fresh marks to me
Edited by erkle
09/10/2012 8:51 pm
|
|
Bedrock of the Community
Australia
21788 Posts |
Accurate measurement of weight should confirm that the coin is composed of standard copper nickel.
|
|
Pillar of the Community
Australia
1244 Posts |
Do you want a brown 50c, just stick it in a bag of 1&2c coins.
We had 5c and 10c coins turn brown this way.
|
|
Valued Member
 Australia
490 Posts |
I am awaiting the seller for an answer to my question on weight...  |
|
Pillar of the Community
Australia
1295 Posts |
Quote:
Last week I saw with my own eyes a 20c coin in a PCGS slab that was 'copper'. The explanation of the error by PCGS was 'annodised' I think. That was one very expensive coin! That had a much deeper copper colour than this 50c. I have my doubts. That coin was most definitely not copper. That coin was what is known as an improperly annealed / sintered planchet. It basically happens when a planchet is covered in copper dust prior to being heat treated and the copper dust forms a coating on the coin. The planchet can get get covered in copper dust because the cleaning facilities might have been used to process 1 or 2c coins and then they were not cleaned properly. Alternatively a coin can become stuck in an annealing oven or pickling barrel and be contaminated with dust that way. |
|
Pillar of the Community
Australia
515 Posts |
I also saw that coin in hand. It was slabbed by PCGS not as a 20c on a copper planchet, but as markn says an improperly annealed/sintered planchet which is an entirely different kettle of fish. A sintered planchet as markn says above is a light copper coating on the surface of the coin. On that particular con you could see a small area by the rim where the cupro-nickel was showing through.
|
|
Valued Member
Australia
490 Posts |
thanks Markn and TPP - I was secretly hoping one of you might comment on this as your valuable insights here, as always, are enlightening. so, the $64 question (or maybe $6.40 question...) - what do you make of this 50c coin on ebay? similar improperly annealed/sintered planchet or not... or can't tell from the provided photos? |
|
Pillar of the Community
Australia
1295 Posts |
Impossible to say. It could be an improperly annealed/sintered planchet, it could be someone's electroplating victim, it could have been left out in the sun for too long, or it could be stained with iodine or bromine or something similar. I'd say with confidence that the LEAST likely thing it could be would be struck with a copper planchet.
|
|
Pillar of the Community
Australia
1005 Posts |
Wow!
I had not heard of that type of error before.
Thanks PP and markn for sharing your knowledge.
Edited by ozcoins
09/11/2012 01:12 am
|
|
Valued Member
Australia
490 Posts |
 thanks Markn... what I thought in the first place... have a great day! |
|
Pillar of the Community
Australia
4411 Posts |
Annealed was the word I was originally going for not annodised  |
|
Pillar of the Community
Australia
1295 Posts |
Well bidiots have taken that 50c up to $137.50. On a similar theme I found the 10c below on the path to the playground down the road. It's distinctly copper in appearance but obviously just coloured due to exposure. The colour doesn't wash off either. If I was a low-life I'd put it up on ebay and see if I could make a quick buck out of it.  |
|
Pillar of the Community
Australia
7096 Posts |
It is amazing what you can do with some brick cleaning acid a few cu/nic coins |
|
Pillar of the Community
Australia
1041 Posts |
There is a note added at the bottom of the listing that he is withdrawing coin from sale,but its still there.I have a 2001 Federation 50c somewhere that is a copper colour,i was told many years ago its from being on the floor of a car and tainted from the rubber or carpet mat & moisture.
|
|
Pillar of the Community
Australia
7096 Posts |
Pub coins  |
|
Page 2 of 2
|
Replies: 22 / Views: 5,013 |
Page 2 of 2
|
First Page
Posted 09/10/2012 9:50 pm
