Ron Guth:
The 1926-D Peace Dollar is one of the more common dates in the series. Among the certified Mint State examples, the most frequently-seen grade is MS-64, with slightly fewer examples in MS-63, and about half as many in MS-65. There are enough MS-66 examples to satisfy collector demand, but anything better is very rare and none have been graded better than MS-67 by PCGS. Most examples offer a good, if not strong, strike. This date is also known for having bright, sometimes booming, luster. Overall eye appeal is satisfactory, although some examples show spidery die cracks that can be distracting. All in all, the 1926-D Peace Dollar is an excellent, affordable choice for type purposes.
According to a notice in the June 1934 issue of The Numismatist (p. 416), collectors could still purchase Uncirculated 1926-D Peace Dollars from the U.S. Treasury for "the face value of the coins and an amount sufficient to cover the mail charrges by first-class mail."