Washington: Two pieces of original artwork from the covers of J.K. Rowling`s Harry Potter books are set to be auctioned .
The watercolours, painted by artist Cliff Wright, are featured on the second and third instalments of the book series.
One of pieces, which was featured on the cover of `Harry Potter and the Chamber of Secrets`, depicts the boy wizard and Ron Weasley in a flying car and is being sold with a reserve price of 20,000 dollars.
While the second is taken from ` Harry Potter and the Prisoner of Azkaban` and has a minimum bid of 12,500 dollars.
The online sale held by Nate D. Saunders auctioneers is set to end on Thursday.