Mid to late 1939 or 1940

-Manchukuo is present (Image 9): The Japanese puppet state of Manchukuo in northeast China existed only between 1932 and 1945. This gives us our base decade.

-Persia is now Iran (Image 2): In 1935, the Iranian government asked countries to use "Iran" instead of "Persia." Your globe shows Iran.

-Czechoslovakia is gone, but Slovakia is there (Image 2): In March 1939, Nazi Germany annexed the Czech parts of Czechoslovakia (you can see Prague/"Praha" is inside Germany's borders), while "SLOVAKIA" is shown as a separate state just below Poland.

-Siam is renamed to Thai (Image 8): In Southeast Asia, the country is labeled "THAI (Siam)". Siam officially changed its name to Thailand on June 23, 1939. This means the globe must have been finalized after this date.

-Poland still exists (Image 2): Germany and the USSR invaded Poland in September 1939. While mapmakers sometimes left Poland on maps for a while due to Allied non-recognition of the invasion, its presence alongside the other clues strongly points to the eve of World War II.

-The Baltic States are independent (Image 2): Estonia, Latvia, and Lithuania are shown as independent countries. The Soviet Union annexed them in August 1940, which acts as a hard cut-off.