Black glossy stacking chair SM400 by Gerd Lange for West German manufacturer Drabert, 1980s. Gerd Lange's chairs have been extremely successful.He had a decisive influence on the design history of the Federal Republic of Germany in the 1970s and 1980s. 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