(Reuters) — The chair that birthed Harry Potter and millions of so-called Potterheads is hitting the auction block. The wooden dinning chair once owned by J.K. Rowling, comes with a letter in which she said she was sad to let it go. “This is a chair that J.K. Rowling wrote the first two Harry Potter books on. And it was in her government flat. It was given to her with a group of chairs. […]