Tulip chairs by Eero Saarinen set of 5

Vintage set of five design classics, the Tulip chair, designed by Eero Saarinen in 1956 and released by Knoll ( marked). It is an early set from the sixties. The seats swivel and have a new red fabric. The condition is good, see the detail photos. The size is 49 cm W / SH 46 cm / 80.5 cm H.