goes on sale on Monday.

The most expensive stamp, costing $1, depicts the Queen Mother, who celebrated her 100th birthday yesterday.

Other Royals included in the set of five are Princess Margaret, the Princess Royal Princess Anne, Prince Andrew and Prince William.

The stamps cost $2.95 in total. A souvenir sheet is $2.95 and the official first day cover is $4.

Generations: Stamps of the Royal Family, including the Queen Mother, who celebrated her 100th birthday yesterday, and Prince William, who recently turned 18, go on sale on Monday.