editing....
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You will also need a list of known coin weights. And if it is a bullion or bar, the weight will be inscribed, remember 1 troy ounce = 31.103 grams; but most scales will convert for you.
This is great information.
One minor nit to pick:
Remember, many gold bullion coins, like the Krugerrand and America's Gold Eagle, contain 1 troy ounce of gold, but have added copper and/or silver, for durability. Pure gold is extremely soft, like lead.
The 1 oz. American Gold Eagle and the Krugerrand weigh 1.0909 troy oz, or 33.930 grams, and contain 1 troy ounce of actual gold. Fractional sizes (1/10, 1/4, 1/2 oz.) vary accordingly.
Other pure gold bullion coins, like the Canadian Maple Leaf, Chinese Pandas, and Australia's Koalas and Kangaroos, are .999 or .9999 fine gold, and weigh exactly 1 troy ounce (or fraction/multiple thereof). These coins are very soft so don't carry them around in your pocket, jingling around with your other change.
SILVER bullion coins always contain .999 or .9999 fine silver, so they contain 1 troy ounce (or fraction/multiple thereof, as marked) of silver.
Here are some recent scores, Traded firearms for this...
What are those coins in the last picture? Never seen any like that before.
Bump for acoustic ring. After stacking for a while you can tell once you get your hands on it. Wont help if you buy it on ebay. One of my favorite sources with reputable sellers is realcent.org
lakota silver rounds.
Lakota Bank rounds. There is some controversy with the company itself but I agree they are pretty rounds. Supposedly the bank stored your silver, made loans on it and paid you interest on it or something like that. They had no ties to the Lakotah native american tribe but kind of tried to make like they did. Just some shady dealings iirc. The rounds are known to be reputable though.
looks like a basic 1 oz silver round
http://www.providentmetals.com/lakota-crazy-horse-1-oz-999-fine-silver-bullion-round-burnished.html
http://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity
I am surprised to see no mention of this