On May 6, 1840, the Penny Black, the world’s first adhesive postage stamp, became valid for use. A quiz on Indian stamps and philately, considered ‘the hobby of kings and king among hobbies’.

Drugmaker GSK said, a stamp has been released by India Post to commemorate its 100 years in India. The ₹5 denomination stamp and “special cover” will be available at 1100 post offices across ...