| Full name | Sport-Club Union von 1903 Altona e.V. | ||
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| Founded | 1903 | ||
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SC Union 03 Altona is a German association football club based in the Altona district of the city of Hamburg. The football team is a department of a larger sports club which also offers handball and tennis.
The football team played in the top flight of the German regional football from 1905 until 1936. Afterwards the team disappeared to the lower levels.