Netherlands

Feb 19, 1937 | Country flag, Merchant flag, Naval flag, Special, State ensign, State flag, War flag |

  Oldest tricolor flag of the...

Turkey

May 29, 1936 | Country flag, Merchant flag, Naval flag, State ensign, State flag, War flag |

Vatican City

Jun 7, 1929 | Country flag, Special, State flag, War flag |

Together with Switzerland the only square flag in the world....

Poland

Aug 1, 1919 | Country flag, State flag, War flag |

...

Ireland

Jan 1, 1919 | Country flag, Merchant flag, Naval flag, State ensign, State flag, War flag |

Austria (Variation)

Jan 1, 1919 | Naval flag, State ensign, State flag, War flag |

...