I'm not sure if anyone was interested, but there is an auction on Heritage currently for (10) 1887 N2 Allen & Ginter "American Indian Chiefs" Collection with the Arrow Point/Black Swan Error.
http://sports.ha.com/itm/non-sport-c...a/7120-81358.s)
The auction includes several graded cards (Agate Arrow Point/White Swan Error (VG3.0!), Deer Ham, Great War Chief and Red Cloud; SGC 35 Good+ 2.5: 2 cards, Geronimo and Striker; SGC 20 Fair 1.5: 2 cards, Chief Joseph and White Shield; SGC 10 Poor 1: 1 card, Bull Head; Ungraded - Big Bear (FR, thin)).
I don't know how many people collect this set, but there is 12 days remaining (Bidding Ends: Nov 6, 2014 at 10:00 PM CT ). -M