Silver Or Copper-Nickel? | Isle Of Man Crown

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Author	Replies: 6 / Views: 11,355
WorldCoinTreasures New Member United States 29 Posts	Posted 02/10/2010 5:33 pm I have a coin from Isle of Man. It looks like a silver coin but there is a Copper-Nickel coin in the same series. Krauses' "KM# 81a CROWN" is silver and "KM# 81 CROWN" is Copper-Nickel. Both coins measure 38.5mm diameter per the book and the one I have is 38.5mm. The weight of the silver coin is given as 28.2800g. but the weight of the Copper-Nickel isn't given. The my scale says the coin weight is 28.5mm plus or minus 0.1g. The difference between the book weight 28.2800 and my scale's reading is only 0.1 to 0.2 grams. Is this enough difference to say the coin is not silver? Is there a way I can determine if a coin is silver without measuring? Thanks for your help! Moved to World Coin forum - Sap Report this Post to the Staff

biokemist6 Bedrock of the Community United States 12437 Posts	Posted 02/10/2010 5:52 pm The silver version is sterling so it should be heavier than an equally sized copper-nickel version Report this Post to the Staff
WorldCoinTreasures New Member United States 29 Posts	Posted 02/10/2010 6:12 pm boikemist6, If I understand correctly, the fact that my coin weighs 0.2 gram more than the weight from the book means I have a silver coin? I guess they wouldn't vary the thickness of the two coins? Thanks for your help. Report this Post to the Staff
Sap Moderator Australia 16831 Posts	Posted 02/15/2010 12:19 am Correct, any change in thickness shouldn't bring the weight up to match or to bring it over the weight of a silver coin. Unfortunately, the Pobjoy Mint seems to assume that all it's coins will perpetually remain in the Pobjoy Mint packaging they were issued in. The coin would have originally come with a certificate of authenticity stating which metal it was made of. 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
nohope587 Pillar of the Community United States 5953 Posts	Posted 02/15/2010 12:24 am Get a clad quarter place it next to crown. then place a white tissue over the two coins. the clad should appear gray if the crown is silver it should appear white. not very scientific but it works on most silver. Report this Post to the Staff
WorldCoinTreasures New Member United States 29 Posts	Posted 02/15/2010 10:11 am Thanks for all the help! Thanks for the tissue trick, I was hoping there was something simple I could do to tell if a coin is silver. Joe Kosedmar Report this Post to the Staff
swamperbob Pillar of the Community United States 5362 Posts	Posted 02/17/2010 12:22 pm Color variations do work - Copper Nickel is darker than Sterling Silver but a simple Specific Gravity test is 100% positive. CN is about 9 and Sterling Silver is 10.3. The test takes a decent scale and 1-2 minutes in time. Report this Post to the Staff
	Replies: 6 / Views: 11,355

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