These industrial chairs were designed by Ahrend Design Team and manufactured by Tan-Sad in the United Kingdom in the 1920s. It features a black metal base with a black seat. Seats are made of early composite type plastic (Bakelite) and have some cracks around the bolted joints as seen in the photos. The chairs are in vintage condition with wear consistent with age and use. 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