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Composition Of Coins

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New Member

Canada
49 Posts
 Posted 10/24/2013  5:19 pm Show Profile   Bookmark this topic Add SilverArt to your friends list Get a Link to this Message Number of Subscribers
Does anyone know what could have made up the coins inside the crystal? It is a late 80s product from China.

Composition-Of-Coins

Composition-Of-Coins

Composition-Of-Coins

Composition-Of-Coins
Edited by SilverArt
10/24/2013 5:32 pm
Pillar of the Community
United States
1666 Posts
 Posted 10/26/2013  5:03 pm  Show Profile   Bookmark this reply Add Numismat to your friends list Get a Link to this Reply
They appear to be gilded with the gold color, which is typical of novelty items like this. Pretty sure if you cut one open the color would be different.
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manymore's Avatar
United States
347 Posts
 Posted 10/26/2013  11:16 pm  Show Profile   Bookmark this reply Add manymore to your friends list Get a Link to this Reply
This Chinese website is selling the item for 300 yuan which is about US$49.

The description states that they are non-circulating "coins" which commemorate the Chinese zodiac animals for the years 1981-1992.

The "coins" were produced at the "China Mint Company Shanghai Mint" but the composition of the "coins" is not mentioned.

Gary
New Member
Canada
49 Posts
 Posted 10/28/2013  11:12 pm  Show Profile   Bookmark this reply Add SilverArt to your friends list Get a Link to this Reply
Thank you all for the great info. Looks like the "coins" should come with a certificate but mine was missing when I got it as a gift many years ago.
Edited by SilverArt
10/28/2013 11:57 pm
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Sap's Avatar
Australia
16861 Posts
 Posted 10/29/2013  12:07 am  Show Profile   Bookmark this reply Add Sap to your friends list Get a Link to this Reply
I believe they are the same little mint medallions they include with the mint sets each year, aren't they? If so, then they aren't technically "coins".
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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sel_69l's Avatar
Australia
21788 Posts
 Posted 10/29/2013  01:59 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
My guess it that they are made from aluminium bronze. If that is the case, they would be the same colour all the way through. Australian aluminium bronze proof coins look very similar to gold, when they are struck as proofs.

Set into an acrylic suspension such as seen here, makes the proof gold appearance look quite effective.
The Australian gold coloured $1 and $2 coins are made from this.
Their composition is
92% Cu
6% Al
2% Ni

As quite a few of us in the CCF may know Al, instantly develops a very thin protective surface layer of Aluminium Oxide., which protects the metal underneath. Thus, Aluminium can retain almost all of it's metallic lustre.
This ability to resist corrosion is imparted on Aluminium bronze.
The small admixture of Nickel is to harden the alloy.
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