What is the value of a 1927 gold Indian head 2 and a half dollar coin?

You are asking about a 1927 US Quarter Eagle (2-1/2 Dollar Indian Head gold coin) (KM#128). The coin is 18mm in diameter, weighs 4.18 grams and is 90% gold, giving it an AGW (Actual Gold Weight) of 0.1209 troy ounces. The is an incused (that is, cut below the surface of the coin , rather than rising above it) image of an American Indian on the front and of an eagle at rest on the back. As of December 15, 2010, with gold at US$1,388 per troy ounce, the coin has a "melt value" of US$167.80.

According to the December 7, 2010, edition of Numismatic News, a 1927 US Quarter Eagle (2-1/2 Dollar Indian Head gold coin) (KM#128) is worth US$225 in Very Fine condition, US$255 in Extremely Fine condition, US$280 in Almost Uncirculated-50 condition, US$340 in MS-60 Uncirculated condition, US$815 in MS-63 Uncirculated condition, and US$3,475 in MS-65 Uncirculated condition.