Austria (Variation)

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

...

Iceland (State flag)

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

...

Azerbaijan

Nov 9, 1918 | Country flag, Merchant flag, Naval flag, State ensign, State flag, War flag |

Thailand (Naval ensign)

Sep 28, 1917 | Naval flag |

...

Morocco (Naval ensign)

Nov 17, 1915 | Naval flag |

...

El Salvador

May 17, 1912 | Naval flag, Special, State flag, War flag |

Flag with the weirdest proportions....