This question comes up fairly often and is a common misunderstanding. US $1 coins made up till 1935 aren't called "eagles" and they don't contain 1 oz of silver. They were ordinary circulation coins made for use in daily commerce. While they do contain silver, it's not as much - about 3/4 of a troy ounce.
"Silver eagles" are modern (1986 and later) coins sold by the Mint as investment pieces, not for spending; their value is linked to the current price of silver and the "$1" value is purely artificial.
The coin you have is frequently called a Morgan dollar after its designer. Its value when minted was in fact exactly $1 because silver was much cheaper and its price was controlled. Today it has value not only for its silver content but for its interest to collectors. There's more information at the Related Question.
2012 olympic
The 2012 American Silver Eagles coins are one ounce of pure silver.
Modern Silver Eagles (1986 to date) contain One Ounce of pure silver.
$550.00
They weigh one troy ounce.
Sorry no US 1845 silver eagles, but there are Seated Liberty dollars of 1845.
1 troy ounce. They are known as silver eagles and have the bullion value on the back.
Yes, Silver Eagles are 99.9% silver.
The first year for Silver Eagles is 1986 and the US never struck any rectangular coins, it's likely a silver ingot bar.
The modern Silver Eagle bullion coin weighs 1 ounce.
no
"Colorized silver eagles" do not exist.