Set of 4 vintage Butterfly 3107 chairs in black metal and teak by Arne Jacobsen, 1971

Set of 4 butterfly chairs model 3107, designed by Arne Jacobsen for Fritz Hansen. Black metal tubular frame and teak seat. Model 1971, indicated on the shell below the chair. Good overall condition, some scratches on the varnish of the seats, probably due to the fact that they have been stacked for decades, see the many photos. 3 of the 4 chairs have their plastic shells underneath, see photos. Dimensions 50x80, 5x52 cm Reference : 303768