372 selected
- Not filled in
- Niger
- Nigeria
- Niue
- North German Postal Area
- North Korea
- North Rhodesia
- Northern Cyprus - Turkish Republic
- Norway
- Oman
- Orange Free State
- Pakistan
- Palestine
- Panama
- Papua New Guinea
- Paraguay
- Persia (Iran)
- Peru
- Philippines
- Pitcairn
- Poland
- Portugal
- Portuguese Africa
- Portuguese Guinea
- Portuguese India
- Portuguese-Timor
- Prussia
- Qatar
- Queensland
- Romania - Occupation of Hungary Oradea
- Romenia
- Russia
- Russia [1857-1917]
- Russia [1866-1919] - Zemstvo
- Russian Federation
- Rwanda
- Saar (1920-1935)
- Saint Christopher-Nevis-Anguilla
- Saint Helena
- Saint Kitts
- Saint Lucia
- Saint Vincent and the Grenadines
- Samoa
- San Marino
- Sao Tome and Principe
- Saudi Arabia
- Saxony
- Schweiz
- Scotland
- Senegal
- Serbia
- Seychelles
- Siam (Thailand)
- Sierra Leone
- Singapore
- Slovakia
- Slovenia
- Solomon Islands
- Somalia
- South Africa
- South Korea
- South Yemen [1967-1990]
- South-West Africa
- Soviet Union
- Spain
- Spain - Local issues
- Sri Lanka (Ceylon)
- Straits Settlements
- Sudan
- Suriname
- Swaziland (Eswatini)
- Sweden
- Switzerland
- Syria
- Taiwan
- Tanganyika
- Tangier - British post office
- Tanzania
- Tasmania
- Thailand (Siam)
- Thrace
- Tibet
- Togo
- Transvaal
- Triest - Zone A
- Trinidad and Tobago
- Tristan da Cunha
- Tunisia
- Turkey (Türkiye)
- Türkiye (Turkey)
- Turkmenistan
- Turks and Caicos Islands
- Uganda
- Ukraine
- United Arab Emirates
- United Kingdom
- United Kingdom (Great Britain)
- United Nations - New York
- United Nations - Vienna
- United States of America (USA)
- Unknown
- Upper Volta
- Uruguay
- USA (United States of America)
- Uzbekistan
- Vatican City
- Venezuela
- Victoria
- Vietnam
- Vietnam - South Vietnam
- Wallis and Futuna
- West African States
- West-Germany
- Western Australia
- Worldwide
- Yemen
- Yemen - Kingdom [1918-1962]
- Yemen - Kingdom [1962-1970]
- Zaïre (Congo-Kinshasa)
- Zambia
- Zanzibar
- Zimbabwe
- Zululand