With the exception of the 1907 high relief pieces, no date or mintmark of the circulation strikes of the Indian Head eagle before 1920 is particularly rare. The 1911-D, with a mintage of 30,100 commands a significant premium in mint state or uncirculated condition, but only a modest one in circulated grades. Despite its mintage of 126,500, the 1920-S is a major rarity. It was little collected at the time, and with Europe still recovering from the war, few coins were exported there; accordingly, most were melted post-1933. Only a handful of 1933 eagles were distributed before Roosevelt ended the paying out of gold, and virtually the entire mintage of 312,500 was melted. One sold in 2004, graded MS-66 (the finest example of this date known) for $718,750. Approximately forty 1933 eagles are known to have survived.
Proof coins were struck from 1907 until 1915, all at Philadelphia. Not all quantities are known, but the highest for which the number struck is known is 1910, with a mintage of 204 (one sold for $80,500 in 2006). One of the surviving specimens of the mostly-melted rounded rim pieces is in proof; this unique specimen is in private hands. Numismatic expert Mike Fuljenz, in his book on the gold pieces with Indian designs struck in the early 20th century, suggests that this coin was a trial piece, resulting from the test of new dies. Different finishes are known for the proof coins. The unique 1907 piece is in satin proof (the raised designs appear like satin), but later proof eagles were struck in a dark matte finish. Some 1908–1910 proof eagles were struck in a lighter “Roman finish”.
Article Source: en.wikipedia.org