David Akers: The 1893-O is scarce, but not really rare in the lower Uncirculated grades. That is, in Choice Uncirculated or lower grades, specimens can generally be located with a little searching. However, in Gem Uncirculated condition, the situation changes dramatically and only a very few such specimens are known...
James A. Stack - Stack's 3/1975:574 - Dr. Thaine B. Price - David Akers 5/1998:128 - Dr. Steven Duckor - Heritage 8/2010:3177, $20,700
Heritage 7/2015:3149, $18,800