This is a bullion coin sold by the US Mint. Its price fluctuates with the price of gold. It contains 1 oz of 0.9999 fine gold, and as of 02/2010 it retails for about $1300.
However, beware of scams involving plated replicas being sold as "gold". See the Discussion section for comments.
Unless it's a proof coin, just face value.
A 2006-W American Eagle bullion gold coin is worth in an uncirculated state: $90.00; should this coin be in a proof state, its value is: $125.
The 2006s 10 coin proof set has a retail value of $31.00 issue price was $16.95
Both versions (Proof & Uncirculated) of this coin have the same average retail value of $115.00
Current retail value for a MS-70 2006 $50.00 Buffalo bullion coin is $1,540.00, the identifier " First Strike" adds nothing to the value.
Unless it's a proof coin or uncirculated, it's worth the same as the hundreds of millions of other state quarters in circulation; i.e. face value only.
5 cents. Gold plating adds a very thin layer of gold on the coin, it hardly increases the coin's value. The 2005 buffalo nickels were intended for circulation and only worth 5 cents unless uncirculated or proof, but since your coin has been damaged due to gold plating, even if it was uncirculated or proof it is now just worth 5 cents.
Even with a Proof coin grade drives value. So from $3,000.00 to $20,000.00.
8-1-11>>> The 2001 Buffalo silver dollar was issued as Proof and Uncirculated, both types have the same value of $115.00.
The 5 coin proof set has a value of $6, the 10 coin set has a value of $15 and the 10 coin silver set has a value of $48.
Average retail value for the Proof coin is about $40.00.
Please take a closer look at your coin. It's a modern state quarter minted in 2006. The minting date is next to the bottom edge. 1889 is the year that the featured state, North Dakota, joined the Union. Unless the coin is in uncirculated or proof condition, it's only worth 25¢.