A rare 159-year-old four-anna (25 paise) Indian stamp, with an image of Queen Victoria's head upside down due to a printing error, is expected to fetch 70,000 pounds at an auction in London.

During the first printing of the four-annas stamp in the survey office in Calcutta (now Kolkata) in 1854, the Queen's head was accidentally printed upside down on the stamp. Moreover, the mistake went unnoticed and dozens of the stamps were sold in India. In fact, the postage stamp is said to be one of the most sought-after items in the world of study of postage stamps.

(AW:Samrat Biswas)