This one at Loisel Vintage
Sketch Found at One Kingslane
Via Ca 20 C via 1stdibs
Joan Burgasser
In a recent comment I gave to the post The Cantilever Chair: By Mart Stam, by Ludwig Mies van der Rohe or by Marcel Breuer? I first came across Joan Burgasser as a former employee for many years of Thonet USA. It appears she was in charge of marketing and kept a fine archive of Thonet which off course has a rich history. But also she has designed at least one chair that Thonet USA featured: A tubular tub club chair
See also One Kingslane