United States rotating office chair circa 1900

American turning desk in wood teinted with mahogany and covered with leather or similar in brown and red tones. A comfortable chair with its iron and cast iron mechanism, its palmette-shaped record, it is around 1900. 
It is sold in its state and fairly good in general. It is visible and retrievable only by appointment. 
Dimensions width 51/63 cm height 50/90 cm depth 50/66 cm