This Kill 6727, the so-called Bird or Tulip chair, is the hard-to-find version of an office chair with height adjustment. The blue leather of the chairs comes in excellent condition with a beautiful patina and minimal signs of wear. Only one chair shows a scuff on the corner of an armrest. The chrome frames with smooth-running wheels show hardly any signs of aging. The hydraulic height adjustment works perfectly on all chairs and allows a seat height of 43 - 51 cm. These chairs can also be fitted with glides instead of casters and can double as dining chairs.  This Kill version is the older original version designed by Kastholm&Fabricius for Alfred Kill International. These chairs were continued to be produced by Knoll in a later version. The designer duo Jorgen Kastholm & Preben Fabricius designed these chairs in the style of functional, aesthetic Scandinavian design in the 60s and created an absolute design icon.