The silver content is valued at the spot price, which is about $10 right now. However, coins such as this usually demand a premium over spot. So if you were to buy on eBay or some similar site it might cost anywhere from $13-$18.
From your description the coin is a Americain Silver Eagle that is made from one ounce of 99.9% pure silver, value as of today is about $19.00
Silver sells for around $14/oz
What is the value of a Silver Platter / WM Rogers 291 With Eagle Star Perfect condition.
A date and if possible a mintmark is needed.
yes
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that is a Silver Eagle, the us government sells them as 1OZ silver bullion. it is almost 100% silver. value depends on condition and date, right now silver is about $25.50 per ounce. so that coin is a MINIMUM of $25 at melt value. a 1996 silver eagle in BU (brilliant un-circulated) condition can go for $50+ while a 2003 eagle can co for $26
That's a one ounce silver round, so the value varies with the price of silver. As of 20 June 2012, silver is $27.90/ounce.
Silver currently sells for about $14/oz.
The bill that most closely fits that description is an 1899 US 1 dollar "black eagle" bill. Please see the question "What is the value of an 1899 US 1 dollar silver certificate?" for more information.
Eisenhower is on the front of the coin, the eagle is on the reverse that's why it's called a Eisenhower dollar. The 1977 coin has no silver regardless of mintmark and is likely only face value especially if it's from a bank or found in circulation.
The coin referred to was minted for Monex International Ltd, a commodities brokerage, by the Royal Canadian Mint. It was minted from 1 troy ounce of .999 fine silver. Coinpage.com refers to the coin as a "Monex International silver round". As for the value, that would be based on the market price of silver more than anything else.