Six stackable Omstak chairs for Bieffeplast, realized in Italy in 1970. Production label. Perforated and bent steel sheet and steel rod. Ref. G. Gramigna, Repertorio del design italiano 1950-2000 per l'arredamento domestico, Allemandi, Torino 2021, p. 179 This piece is attributed to the mentioned designer/maker. It has no attribution mark and no official proof of authenticity, however it is well documented in design history. I take full responsibility for any authenticity issues arising from misattribution