David Akers: The 1909-O Barber Half Dollar had a low mintage of less than 1,000,000 pieces, and it represents the final year from this historic southern mint. In mint state condition, all grades considered, the 1909-O is only scarce and not rare. This means that in grades below Gem condition, it can be obtained with only a moderate amount of difficulty. However, strictly graded Gems...are very rare, and those that are well struck and have excellent luster and eye appeaal are even more rare since they constitute only a very small fraction of the available mint state specimens. This issue is considerably more rare than either of the two immediately preceding O Mint issues, i.e. the 1907-O and 1908-O, but, of course, it is not nearly as rare as any of the O Mint issue prior to 1907.
Bowers & Merena "Emery & Nichols Collections" 11/1984:847 - Dr. Thaine B. Price - David Akers 5/1998:179 - Dr. Steven Duckor - Heritage 8/2010:3228, $9,775