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Brunei: 20 sen 1994, km37, 1 cu-ni, 1 brass?

Started by Globetrotter, December 18, 2013, 03:23:27 PM

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Globetrotter

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

Prosit

I have a 1994. It looks like Nickel.
Dale

Quote from: Globetrotter 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

Globetrotter

Hi,

yes, like mine on the right.

Thanks for your answer

Afrasi

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.

Globetrotter

So how do you consider it, as normal thing or as a variant?

Thanks

Afrasi

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)

Figleaf

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.

Globetrotter

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

Afrasi

One more idea: Would you, please, weigh your coin exactly?

Globetrotter

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

Afrasi

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 ...)

Figleaf

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.

Globetrotter

 :D the one looking white is the normal one, the yellow the bastard >:D