The chair is complete with hand-painted decorations by Rowling which includes the phrases:  "O you may not find me pretty, but don't judge on what you see," which of course die-hard fans will recognise as the Sorting Hat's opening lines in the first book. The chair also says: "I wrote Harry Potter while sitting on this chair" and "Gryffindor" as well as Rowling's signature and lightning bolts.

JK Rowling's Harry Potter chair, on sale at Heritage. JK Rowling's Harry Potter chair, on sale at Heritage.

Back in 2002, Rowling created a hand-painted chair for Christie's Chair-ish a Child charity auction for the NSPCC, where it sold for $21 000 to Miles Apthrop. In 2009, the chair sold on eBay for $29 000.

Heritage pubic relations director Noah Fleisher commented how: "This is not just a chair. It's a work of art."

"It's a piece of pop culture memorabilia, it's a piece of writing history, and it deserves to be enshrined in somebody's home, or in a museum."

To excite fans even more, the chair is accompanied by a signed letter for JK Rowling, complete with an "owl post" stamp, naturally.

Rowling first sat down in the chair in 1995, where she sat at her typewriter to write both Harry Potter and the Philosopher's Stone (known as Sorcerer's Stone in the States) and Harry Potter and the Chamber of Secrets.

James Gannon, Heritage's director of rare books stated: "Rowling transformed this ordinary piece of furniture into a work of literary art."

"It lives now as a powerful, tangible symbol of her determination and incredible imagination. She started in this chair as an impoverished woman and mother with a dream and rose from it as a giant of modern fiction."

Rowling commented that her ''nostalgic side is quite sad to see it go, but my back isn't.''

Online bids can be placed on the chair from March 18 in Heritage's Rare Books Signature sale, which concludes on April 6. The starting bid is $45 000.

Check out Heritage's full catalog on Barnebys here.