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What Is The Weight Of A 1973 St. Helena 25 Pence Coin?

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fmtaxguy's Avatar
United States
257 Posts
 Posted 02/26/2010  7:16 pm Show Profile   Bookmark this topic Add fmtaxguy to your friends list Get a Link to this Message Number of Subscribers
I recently obtained a 1973 St. Helena 25 Pence coin, but am trying to determine, by weight, whether it is the copper-nickel version (100k minted) or the silver proof version (10k minted) without taking it out of the flip. The 2010 Krause catalog provides the weight of the silver proof, but not of the circulation coin. Google has provided no help. Does anyone know the weight of the copper-nickel version? Thanks in advance.
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COINAHOLIC's Avatar
United States
1501 Posts
 Posted 02/26/2010  8:53 pm  Show Profile   Bookmark this reply Add COINAHOLIC to your friends list Get a Link to this Reply
I see what you mean, I looked it up and my guess would be, being that both coins are 38.5 mm in size I would say the CuNi coin would weigh less than the 28.2800 grams of the proof.
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fmtaxguy's Avatar
United States
257 Posts
 Posted 02/27/2010  07:39 am  Show Profile   Bookmark this reply Add fmtaxguy to your friends list Get a Link to this Reply
Thanks for the input. Your conclusion is certainly based in logic. One piece of missing information may, however, undermine the conclusion. We don't don't know if the thickness of the coin is also equal, as is the diameter.

Would it be possible to tell the difference visually by, say, color? This coin is a shiny silver color with what appears to be the slightest beginning hint of an even champagne toning. Would the copper-nickel produce more of a copper color? The fields are not mirror-like as one might expect from a proof.

I am trying to avoid removing the coin from its holder in order to determine, with certainty, the composition of the metal in this coin.
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Germany
1238 Posts
 Posted 02/27/2010  1:53 pm  Show Profile   Bookmark this reply Add chrisild to your friends list Get a Link to this Reply
As far as I know, the silver and Cu-Ni versions of those crowns have the same size (diameter) and the same weight. What should indeed be different is the thickness. And yes, usually the solor of a silver coin is more, hmm, yellowish? than that of a copper-nickel coin. But it's not quite that easy to tell if you cannot see both types. Also have a look at this topic: https://goccf.com/t/59855

Christian
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