Latvia issued its own stamps and was a free state until 1940, when it became part of the Soviet Union. In 1991 Latvia began to issue its own stamps again after it broke away from the Soviet Union. Some examples of Latvia stamps is as follows:
(Overprinted on stamps of Germany during German occupation in 1919.)
(Overprinted on stamps of Russia during German occupation.)
Overprinted on stamps of Latvia during Russian occupation.