Set of 4 Kembo chairs

Set of 4 dining table chairs, most probably from the Dutch firm Kembo, from the early 1960's. The design of the chairs can also be traced back to a design of Wim Rietveld for Gispen. The set consist of 2 chairs with wooden armrest ( originaly black colored) and 2 chairs without armrest. The chairs are upholstered with black skai and are in a good and original condition, also given it's age ( see detailed picutes). The dimension is cm H/ 47 cm SH/ 41 cm W/ 61 cm