Stamps from 1920s 1930s from these places:
United States
Angola
Argentina
Australia
Austria
Azores
Bavaria
Belgium
Bosnia
Brazil
Carinthia
Bulgaria
Canada
Panama Canal Zone
Chad
Cape of Good Hope
Cape Verde Islands
Ceylon
Lithuania
Chile
China
Colombia
Congo
Congo
Costa Rica
Crete
Cuba
Czechoslovakia
Danzig
Denmark
Dominican Republic
dutch Indies
Ecuador
Epirus
France
French Soudan
French Guiana
Georgia
Germany
Great Britain
Greece
Guadeloupe
Haiti
Honduras
Hungary
Iceland
India
Indo China
Irish Free State
Italian Somaliland
Italy
Ivory Coast
Jamaica
Japan
Jugoslavia
Shanghai
Latvia
Liechtenstein
Luxemburg
Madagascar
Mauritania
Mexico
Middle Congo
Mozambique
Netherlands
New Caledonia
New Foundland
New South Wales
New Zealand
Nicaragua
North Borneo
Norway
Panama
Palestine
Persia
Peru
Philippines
Poland
Porto Rico
Portugal
Prussia
Queensland
Roumania
Russia
St Pierre and Miquelon
Salvador
Senegal
Serbia
Somali Coast
South Australia
Spain
Straits Settlements
Syria
Sweden
Switzerland
Transvaal
Turkey
South Africa
Ukrainia
Upper Silesia
Uruguay
Venezuela
Venezuela
Wurtemberg