If A Proof Coin Loses It's Finish...

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Author	Replies: 5 / Views: 1,248
snowman Pillar of the Community United States 1840 Posts	Posted 11/18/2007 11:49 am ...is it still a proof coin? I'm just wondering because I recently purchased a lot of coins that included a 1964 Austrian proof set. The coins were kept loose (ie in with the rest of the collection) and the aluminum coins now don't look any different than a coin minted for circulation. Would there be any way to prove that the 10 Groschen is proof? Report this Post to the Staff

gxseries Pillar of the Community Australia 3831 Posts	Posted 11/18/2007 1:13 pm Get another 1964 proof set and compare. That might be the fastest as it's possible that some people might have replaced the proof coins with some UNC and sold it as such. My partial coin collection http://www.omnicoin.com/collection/gxseries My numismatics articles and collection: http://www.gxseries.com/numis/numis_index.htm Regularly updated at least once a month. Report this Post to the Staff
Bryan1315 Bedrock of the Community United States 14454 Posts	Posted 11/18/2007 3:31 pm I know nothing about Aussie coins but in the US different mints mint different coins for circulation and proof coins. technically a proof coin is always a proof coin because of the way it was minted (has nothing to do with the finish on the coin). But as I said I have no idea how Aussie coins are minted nor do I know the differences between proof and business strike coins but I am sure someone will be able to tell the difference. Even if the proof coin has been circulated it is still a proof coin though Report this Post to the Staff
gxseries Pillar of the Community Australia 3831 Posts	Posted 11/18/2007 3:36 pm Bryan, it's Austrian, not Australia If it is a 1964 Aussie proof set, those will cost a fair bit. My partial coin collection http://www.omnicoin.com/collection/gxseries My numismatics articles and collection: http://www.gxseries.com/numis/numis_index.htm Regularly updated at least once a month. Report this Post to the Staff
snowman Pillar of the Community United States 1840 Posts	Posted 11/18/2007 7:40 pm Here's the funny thing, the value of a '64 proof 10 Groschen is actually less than an UNC one. Since this coin is still in UNC condition I doubt anyone would swap it out. As far as a side-by-side goes, I think my '97 non-proof Groschen looks more proof-like: Oh well. Thanks for your replies guys! Report this Post to the Staff
Sap Moderator Australia 16826 Posts	Posted 11/19/2007 03:52 am As the numismatic dictionaries will all state, "proof" is a method of manufacture, not a condition or grade. A coin doesn't lose it's "proofness" by being removed from the wrapper or even by being spent and circulated. Exactly how "proof" coins are made will depend on the process used at that mint at that time, but modern proofs are usually struck from specially prepared dies, using specially prepared blanks and handled with extra care to avoid mint damage. Often the press (a low-speed, high-pressure machine set aside for striking proof coins) will strike the coin twice, rather than the usual once. Theoretically, you should be able to tell the difference, as the dies will be different. In practice, it may be impossible to tell them apart without expert knowledge of the series and/or a microscope. 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 Edited by Sap 11/19/2007 04:01 am Report this Post to the Staff
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