It is clear that some countries worked with these prefixes in 1927-1928, and then switched to others, more familiar to us, some continued to work with these prefixes in the following years.

FA – Abyssinia (currently - Ethiopia and Eritrea)

FB – Madagascar

FB – Reunion

FB – Comoros

FB – Juan de Nova

FB – Glorioso

FB – Tromelin

FC – Belgian Congo

FC – Ruanda

FC – Urundi

FD – Angola & Kabinda

FE – Egypt

FF – French Sudan

FF – Mauritania

FF – Senegal

FF – French Guinea

FF – Ivory Coast

FF – Upper Volta

FF – Dahomey

FF – Civil Territory of Niger

FF – French Togoland

FG – Gambia

FH – Italian Somaliland

FI – Italian Lybia (Tripolitania & Cyrenaica)

FJ – Somaliland Protectorate

FJ – Socotra

FK – Kenya

FK – Zanzibar Protectorate

FK – Uganda

FK – Anglo-Egyptian Sudan

FK – Tanganyika Territory

FL – Liberia

FM – Tunisia

FM – Algeria

FM – Morocco (including the Spanish zone)

FM – Tangier

FN – Nigeria

FO – Union of South Africa

FO – Northern Rhodesia

FO – Southern Rhodesia

FO – Bechuanaland Protectorate

FO – Southwest Africa

FP – Portuguese Guinea

FP – Cape Verde

FQ – French Equatorial Africa

FQ – Cameroons

FR – Rio de Oro and adjacent Spanish Zones

FR – Ifni

FR – Canary Islands

FS – Sierra Leone

FT – Eritrea

FU – Rio Muni (Spanish Guinea)

FU – Fernando Po

FV – French Somaliland

FW – Gold Coast Colony

FW – Ashhanti

FW – Northern Territories

FW – British Togoland

FX – Seychelle Dependencies

FZ - Mozambique

List Courtesy of R0L-123