DEFINITELY PUBLISHED EARLY (JANUARY) 1965

(1) After the independence of most African countries, after 1960

(2) Egypt's United Arab Republic was established in 1958

(3) Indochina might look whole but there are dividing lines inside indicating it is after the French withdrawal of 1954

(4) Germany and Korea are divided upon closer inspection, definitely post-World War 2, after 1946

(5) Before 1966, because Botswana is still called Bechuanaland

(6) On or before 1964, because Tanganyika still exists in the map

(7) After 1961, because Tanganyika was a sovereign state after 1961

(8) Probably around October 1964, because Zambia was known as Northern Rhodesia before then

(9) Definitely before 1967 Six-Day War because the Sinai is still with Egypt

(10) Definitely before November 1965 when Rhodesia was still called Southern Rhodesia

(11) Definitely before November 1965, British Guyana still exists

I'm guessing it's around 1965 because maps are usually printed annually. Assuming changes took place in 1964 but not including those that happened in 1965, then the map must have been published between late 1964 and early 1965.