This is rarer than common date coin with a mintage of about 429000 for that year. This compares to a common date coin such as a 1908 NM with a mintage of almost 4.3M coins.
PCGS pop is 2226 with 1248 graded higher. With prices not so much higher than a common date, this is probably a better value. The item "1910-D St Gaudens $20 Double Eagle PCGS MS64" is in sale since Saturday, June 23, 2018. This item is in the category "Coins & Paper Money\Coins\ US\Gold (Pre-1933)\$20, Double Eagle". The seller is "collossus1" and is located in Huntington Beach, California.This item can be shipped to United States.