What's the difference between 1 oz. And 1 troy oz.?

What is the difference in a 1 oz. Silver/gold coin and a 1 troy oz. Silver/gold coin ?

Answer #1

Here is a site with the value differences between the two:

http://lynncoins.com/troy_ounce.htm

And a site explaining why the Troy ounce is still used:

http://en.wikipedia.org/wiki/Troy_ounce

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