Author Topic: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?  (Read 1577 times)

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Offline Globetrotter

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Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« on: December 18, 2013, 03:23:27 PM »
Hi,

has any of you seen this before? It might be electrolysis made by a person as a joke, but if anybody has a similar, then it might be in the mint?

Thanks for checking yours
Ole

If you're interested in coin variants please find some English documentation here:
https://sites.google.com/site/coinvarietiescollection/home
and in French on Michel's site (the presentations are not the same):
http://monnaiesetvarietes.esy.es/

Offline Prosit

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #1 on: December 18, 2013, 04:08:00 PM »
I have a 1994. It looks like Nickel.
Dale

Hi,

has any of you seen this before? It might be electrolysis made by a person as a joke, but if anybody has a similar, then it might be in the mint?

Thanks for checking yours

Offline Globetrotter

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #2 on: December 18, 2013, 05:17:37 PM »
Hi,

yes, like mine on the right.

Thanks for your answer
Ole

If you're interested in coin variants please find some English documentation here:
https://sites.google.com/site/coinvarietiescollection/home
and in French on Michel's site (the presentations are not the same):
http://monnaiesetvarietes.esy.es/

Offline Afrasi

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #3 on: December 18, 2013, 07:10:32 PM »
This may happen to coppernickel easily at the end of the production, but this piece got its colour probably being encased long time in a plastic-packed set.

Offline Globetrotter

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #4 on: December 18, 2013, 07:26:21 PM »
So how do you consider it, as normal thing or as a variant?

Thanks
Ole

If you're interested in coin variants please find some English documentation here:
https://sites.google.com/site/coinvarietiescollection/home
and in French on Michel's site (the presentations are not the same):
http://monnaiesetvarietes.esy.es/

Offline Afrasi

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #5 on: December 18, 2013, 10:37:32 PM »
Judging only from the picture it is not brass but copper-nickel with shade of copper by storage. So it is no variant in my opinion. But there may be other opinions around the world ...  8)

Offline Figleaf

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #6 on: December 18, 2013, 10:51:27 PM »
I have seen cu-ni coins turn pale yellow from hard plastic. This coin looks a shade darker, but Afrasi's theory sound good to me. Not a variant, just discolouring.

I would give the other coin an acetone bath. It has been in bad plastic for a number of years. If the acetone doesn't help, work it carefully with either a soft cloth or a soft eraser while the acetone is still on it. In a few years, you won't get the haze off so easily.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.

Offline Globetrotter

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #7 on: December 18, 2013, 11:03:47 PM »
The only left for me to say, is first thanks for all your opinions, the second is that the look of the surface is exactly as on the 1 sen coins 34b, that is to say brass, not copper. I have seen cu-ni coins turns brownish, but this one would be the first one going "yellow"... that's why I thought maybe somebody had played with an electrolysis solution. When I'm back from the States in January I'll try the acetone to see what comes out of that.

Merry xmas and a happy new year to all of you
Ole

If you're interested in coin variants please find some English documentation here:
https://sites.google.com/site/coinvarietiescollection/home
and in French on Michel's site (the presentations are not the same):
http://monnaiesetvarietes.esy.es/

Offline Afrasi

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #8 on: December 18, 2013, 11:22:47 PM »
One more idea: Would you, please, weigh your coin exactly?

Offline Globetrotter

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #9 on: December 18, 2013, 11:29:29 PM »
That's already done, and no differences worth talking about:

METAL   Weight   Diam1   Thick   edge   Orientation
cu-ni   5,64   23,64   1,85   r   m
ni-brass   5,66   23,63   1,94   r   m

Ole
Ole

If you're interested in coin variants please find some English documentation here:
https://sites.google.com/site/coinvarietiescollection/home
and in French on Michel's site (the presentations are not the same):
http://monnaiesetvarietes.esy.es/

Offline Afrasi

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #10 on: December 19, 2013, 12:03:29 AM »
I give up. :-[

But wait with any cleaning until you are 100 % sure, as the coin is beautiful in a perfect status. (But that's why Peter and I guessed, it must be from a sealed set ...)

Offline Figleaf

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #11 on: December 19, 2013, 12:33:17 AM »
Just to make 100% sure: it's the right coin that needs cleaning! The one that looks white, rather than yellow.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.

Offline Globetrotter

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Re: Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?
« Reply #12 on: December 19, 2013, 08:20:52 AM »
 :D the one looking white is the normal one, the yellow the bastard >:D
Ole

If you're interested in coin variants please find some English documentation here:
https://sites.google.com/site/coinvarietiescollection/home
and in French on Michel's site (the presentations are not the same):
http://monnaiesetvarietes.esy.es/