What are 'Star Series' banknotes, over which RBI has issued a clarification?

RBI has clarified that banknotes with a star (*) symbol on the number panel are authentic. The symbol is an identifier indicating that the note is a replacement for defectively printed ones in a packet of 100 pieces of serially numbered banknotes. They are exactly similar to the other banknotes, but have an additional character, which is the *(star).