Red and blue one.... interesting piece of art history, but when I have a decent workshop, my first built would be the steltman !
Could ever compare the dimensions given in the book to one of the real chairs ? I don't know about this books, but on some other I found that some slight (probably intentional) errors in the given dimensions allowed you to make a look-like furniture, but definitively not something that have this "accomplished" feeling that made the original famous.