Chair by Konstantin Grcic for Cappellini 1993

Very rare folding chair, model start, designed by konstantin grcic in 1993 for cappellini italy. I only found 1 online and that one is in the collection of the museum boymans & van beuningen in rotterdam. The idea of the chair is based on cinema chairs and a design of jean prouve. There's 2 versions of the chair, 1 with and 1 without armrests. The chair is fully made of black metal. It is in good original condition. Some normal traces of use.