Harry Potter author JK Rowling's signature is the most desired in the world, ahead of signatures of stars like boxing legend Muhammad Ali and the King of Pop Michael Jackson.
The Brit author has made it to a list of the world's most valuable autographs compiled by memorabilia specialist Paul Fraser Collectibles.
Her signature is worth more than those of Madonna, Beatles drummer Ringo Starr and artist Salvador Dali.
Investors have been asked to look for signed copies of books by the Edinburgh-based author, as they are a more profitable than stocks and shares.
According to the new research, the multi-millionairess' signature has increased in value from 395 pounds to 1,200 pounds over the past ten years, rising by 204 per cent.
"The Boy Wizard is a proven global phenomenon and there isn't enough JK Rowling memorabilia to meet demand," the Scotsman quoted Paul Fraser, an expert in high-end collectible items as saying.
"Harry Potter is the highest- grossing film series of all time, with 5.4 billion dollars worldwide receipts," he added.
"Rowling's signature is a perfect opportunity for entry-level investors," he further said.