Iconic 3-seater sofa/sleeping bench designed by Gijs van der Sluis for Gispen, The Netherlands, 1960s.
The seating depth can very easily be extended by raising and pulling out the seat, so it can be used as a 1 person sleeping bed. The additional armrest pillow can be placed where ever you need it. 
Completely restored: new foam, new upholstery (black wool bouclé and Kvadrat armrest).
Minor wear to the metal, grey laquered base.