Industrial drafting automatic adjustable stool, Kewaunee MFG. Drafting stool with backrest, 1930s, USA. The height of the stool is adjustable, by simply sliding the seat up or down. The seat height range is from 47 cm to 67 cm. The backrest is also adjustable. The seat is made from solid wood, the backrest and base of the stool are from metal. The original manufacturer's label is affixed to the backrest, original operating instructions label is on the bottom of the seat. I have official proof of authenticity such as vintage catalogs, designer records, or other literature sources and take full responsibility for any authenticity issues arising from misattribution