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Show your coins struck on non-standard metal / materials


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I admit I got the idea off Boydle: http://www.coinpeople.com/index.php?showtopic=24682

His coins are struck in carbon which is very impressive.


Please feel free to show off your collection of coins which are not struck in standard metals (alloys) and other materials. Also please feel free to show interesting plating coins where possible. Examples are such as Austria's niobium coin and Kazakhstan's tantalum space coin.


Here are some of my examples:


Japan 1945 1 sen (clay)




Composition: 60% clay (Sankansaka), 15% granite, 15% red clay, 10% other


Kazakhstan 2006 500 tenge (silver-tantalum)




Mexico 2001 5 peso




Now you might be puzzled why I posted this. If it was possible, I would have illustrated a 5 or 10 cents but I don't have them in my collection. What fascinates me is the outer ring - it is a stainless steel alloy but I have never seen any alloy composition like this:


* Between 16% and 18% (sixteen and eighteen percent) chrome;

* 0.75% (seventy-five basis points) nickel, maximum;

* 0.12% (twelve basis points) carbon, maximum;

* 1% (one percent) silicon, maximum;

* 1% (one percent) manganese, maximum;

* 0.03% (three basis points) sulfur, maximum;

* 0.04% (four basis points) phosphorus, maximum; and

* The remainder, iron.


Taken from the Bank of Mexico: http://www.banxico.org.mx/sitioingles/bill...ntManufact.html


Carbon? Silicon? Sulfur? Chrome? Wow. Doesn't get any interesting than this.


And finally, one interesting copper plated aluminum coin from Korea:




Copper plated steel and copper plated zinc - sure they are common but copper plated aluminum? Don't think I have heard of that before.


Also, let's not forget about US coinages - dollar coins are struck with a Copper-Manganese alloy and this is not common in world coinage. I am not too sure if anywhere else in the world uses it.




Here's one link that I still enjoy to read: http://www.ukcoinpics.co.uk/metal.html I'm still looking for the Chinese antimony coin ;)


Now is your turn to share yours! :ninja:

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Copper plated steel and copper plated zinc - sure they are common but copper plated aluminum? Don't think I have heard of that before.


The only other copper plated aluminum coins were issued by Israel in 1957.

Personally I like the Algerian 10 Dinars - these have a steel ring and an aluminum centre, the only two metal coins with aluminum.

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56% copper, 35% silver, 9% manganese. While this could be considered a type of billon (which is not all that uncommon in coinage), it is highly unusual that a small amount of a relatively cheap metal (nickel) was replaced by a larger amount of a precious metal (silver), as opposed to a cheaper metal (steel or iron) during wartime. I could easily be wrong, but I cannot think of another "emergency" wartime issue that is worth intrinsically more than its pre-war counterpart.

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bass clad steel

Yep; strictly speaking, the German 5 and 10 Pf coins from those years are made of tombac plated steel. (In this case, tombac means precisely 72% Cu and 28% Zn.) The French 1 centime coin is a steel piece.


Those silver-niobium coins were initially issued by Austria. But the Austrian Mint now makes them for other countries too. Here is one from Latvia (1 lats 2004):




And this is one from Luxembourg (5 euro 2009); the other side shows Grand Duke Henri as usual.




Of course those silver-niobium "coins" are not issued for circulation but for collectors only.



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ANA World's Fair of Money (Winter Convention) 2000. 20 mm Piedfort struck on pewter by Gallery Mint Museum


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