| Laos | King Sisavang Vong | 1885 | 1904 |
| Norway | King Haakon VII | 1872 | 1905 |
| Nepal | King Tribhuvan | 1906 | 1911 |
| Luxembourg | Grand Duchess Charlotte | 1896 | 1919 |
| Japan | Emperor Hirohito | 1901 | 1926 |
| Ethiopia | Emperor Haile Selassie | 1892 | 1930 (Regent 1916) |
| Muscat & Oman | Sultan Sayyid bin Taimur | 1910 | 1932 |
| Saudi Arabia | King Ibn Saud | 1876 | 1932 |
| Afghanistan | King Zahir Shah | 1914 | 1933 |
| Liechtenstein | Prince Franz Josef II | 1906 | 1938 |
| Vatican City | Pope Pius XII | 1876 | 1939 |
| Iraq | King Faisal II | 1935 | 1939 |
| Cambodia | King Norodom Sihanouk | 1922 | 1941 |
| Iran | Shah Mohammed Reza Pahlavi | 1919 | 1941 |
| Thailand | King Bhumibol Adulyadej | 1927 | 1946 |
| Greece | King Paul I | 1901 | 1947 |
| Denmark | King Frederik IX | 1899 | 1947 |
| Netherlands | Queen Juliana | 1909 | 1948 |
| Monaco | Prince Rainier III | 1923 | 1949 |
| Sweden | King Gustaf VI Adolf | 1882 | 1950 |
| Belgium | King Baudouin I | 1930 | 1951 |
| Libya | King Idris I | 1890 | 1951 |
| United Kingdom Canada Australia New Zealand South Africa Ceylon Pakistan | Queen Elizabeth II | 1926 | 1952 |
| Egypt | King Fuad II | 1952 | 1952 |
| Jordan | King Hussein | 1935 | 1952 |
| Bhutan | King Jigme Dorji Wangchuk | 1928 | 1952 |