Flag of the Azerbaijan SSR
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The flag of SSRA (Azerbaijan SSR) was first adopted in 1920, and was a red flag with a yellow crescent and star in the left upper corner.
From the second part of 1921 to 1922, Azerbaijan SSR used a red flag with the yellow Cyrillic characters ССРА ("SSRA").
In 1937, golden hammer and sickle were added in the top left hand corner, with beneath the Latin characters AzSSR in a serif font in place of the Cyrillic characters.
A third version was issued in 1940s, and had AzSSR substituted by its Cyrillic version АзССР.
The last version of the flag was adopted by the Azerbaijan SSR on October 7, 1952. It was the flag of the Soviet Union, with an horizontal blue band on the bottom fourth.