

See some similarity with "Baule Chief's Spirit Chair" in lot 31 in the Sotheby Parke Bernet catalogue of African & Oceanic Art for its November 9, 1979 New York auction, sale no. 4305.
Another similar chair of the Guro appears in lot 200 on p43 of Cornette de Saint Cyr catalogue of 5Mars 2004 Paris auction at Hotel Drouot.
See a section on "Wooden chairs" in the Museum Rietberg, Zurich publication Guro by Eberhard Fischer (2008) 486-9 with a photograph of a similar chair (the faces being elongated human faces rather than fowl) on p486, ill. 557 with the following caption "Chair with decorated back, acquired in Duizra (H. 52 cm), private collection, Zurich."
See a similar Guro chair with a carved curved back in the Juin 2004 Paris' Galerie Ratton-Hourdé exhibition catalogue Atlantes & Caryatides - Trônes D'Afrique Noire, 73 with the following caption on p72: "Gouro (Côte d'Ivoire). Hauteur: 50 cm."
See color photograph of a similar Guro chair in African Seats edited by Sandro Bocola (1995) 71 & a black & white illustration on p171 fig 17. It's listed as being in a private Zurich collection. Caption with nice discussion.