1960s Rare Arne Jacobsen Butterfly Auditorium chairs by Fritz Hansen Extremly rare auditorium version of the Iconic chair model 3107 / butterfly from the 7 series designed by Arne Jacobsen and manufactured by Fritz Hansen, Denmark in the 1960s. The seats of the chairs are mounted on top of the original Fritz Hansen auditorium frame that is to be mounted onto the floor with screws at the base and upholstered with original black faux leather. The chairs are in good vintage condition. This piece has an attribution mark, I am sure that it is completely authentic and take full responsibility for any authenticity issues arising from misattribution