A. Great Britain
An Australian Stamp, issued 2003, celebrating the 50th anniversary of Queen Elizabeth II's coronation.
B. The Netherlands
A Dutch stamp celebrating four queens: Emma, Wilhelmina, Juliana, and Beatrix
This charity stamp featuring Crown Prince Frederik, Crown Princess Mary and Prince Christian of Denmark, was issued on 10 January 2007.
Source: WNS Stamps
Prince Philippe, Princess Mathilde, and Princess Elisabeth on the occasion of Princess Elisabeth's first birthday.
Source: De Post
Wedding stamp - Prince Albert and Princess Charlene on one of the official wedding stamps issued by the post of Monaco in 2011.
Source: phil poste
New stamps mark the 75th birthdays of King Harald and Queen Sonja.
Source: Stamp News
A stamp shows the Spanish King Juan Carlos and his wife, Queen Sofia.
Crown Princess Victoria and Prince Daniel on a commemorative stamp released by Sweden's postal service prior to their wedding in 2012.