PCGS grade. Probably from the John Clapp collection and probably acquired by John Clapp directly from the Denver Mint in 1908. Purchased at the Bowers & Ruddy Oct '82 Eliasberg sale by Jeff Garrett for $18,700. Note that Eliasberg also had a 1909-S with an estimated grade of MS67. Lot #848. Image courtesy of Heritage Numismatic Auctions.
In keeping with David Akers' narrative below, the 1908-D $10 With Motto is a common coin in most grades, including Mint State grades up to (and including) MS63. In MS64, the population drops significantly, then drops even more precipitously in MS65. Akers claim that "relatively few specimens exist better than MS-63" is not borne out by recent population reports. In fact, the PCGS CoinFacts Condition Census includes ten coins that are MS66 and better. The two best pieces are a pair of PCGS MS-68's. The monster Eliasberg-Akers-Duckor PCGS MS68 sold for a record $230,000 in 2006. In 2004 the Price-Michaels-Simpson PCGS MS68 sold for what appears to be the bargain price of $86,250.
Dr. Thaine B. Price Collection - David Akers 5/1998:46, $82,500 - Wm. Thomas Michaels Collection - Stack's 1/21/2004:3007, $86,250 - Simpson Collection
Louis Eliasberg, Sr. - Bowers & Ruddy 10/1982:848 - Dr. Steven Duckor - Heritage 4/2006:3884, $230,000