Has There Been A Change In Metal Composition?

To participate in the forum you must log in or register.

Author	Replies: 3 / Views: 2,042
gxseries Pillar of the Community Australia 3831 Posts	Posted 07/28/2016 01:16 am From time to time, I do find nice aUNC nickel copper coins struck in between 1960s to 1980s. They seem to be quite different from 1990s onward. The best way I can describe it is that the earlier coins seem to be more greyish compared to the newer coins which seem to have a sharper brilliant finish. The mint website specifics that they have been struck with 75% copper and 25% nickel. I cannot help wondering - has there been some changes to the alloy or manufacturing process? 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

Sap Moderator Australia 16873 Posts	Posted 07/28/2016 04:24 am The cupronickel alloy is unchanged. The manufacturing process has probably changed, in terms of die preparation, which will probably go a long way to=wards explaining any visible differences in circulation coinage appearance. 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 Report this Post to the Staff
Basil Pillar of the Community Australia 1041 Posts	Posted 07/28/2016 07:55 am Quote: I cannot help wondering - has there been some changes to the alloy or manufacturing process? I read a few years ago the metal is cured/treated differently to previous years to maintain a stronger/brighter finish. Report this Post to the Staff
Nevol Formerly nancyc Australia 5385 Posts	Posted 07/28/2016 6:32 pm I noticed quite some years ago, before I quit noodling, that some coins did appear to hold their condition better and I put it down to a couple factors: 1. Coins were minted elsewhere, eg Canada or RM 2. Possibility of the blanks used in other countries' mints being slightly different to the Aussie blanks. 1981 coins were the ones I can remember that stood out the most. life is a mystery to be lived not a problem to be solved Report this Post to the Staff
	Replies: 3 / Views: 2,042

To participate in the forum you must log in or register.

All Forums Category: Australia, New Zealand, and South Pacific (Oceania) Coins and Currency Forums Forum: Coins, Bank Notes, and Paper Money: Australia, New Zealand, & South Pacific (Oceania)

Silver Gold Bull US is the United States leading bullion dealer. We deliver gold coins, gold bars, silver coins, silver bars and precious metals to your door. Order today!

The First Dollar, your premier source for bullion and rare coins. See our bullion list on the site and the coin inventory on ebay.

View Last 100 New Topics

View Last 100 Active Topics

Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited.
Contact Us | Advertise Here | Privacy Policy / Terms of Use

Coin Community Forum

It took 0.26 seconds to rattle this change.