Sp.Vg. Blau-Weiß 1890 Berlin, generally referred to as Blau-Weiß 90, was a German association football club based in the Mariendorf district of Berlin. The club was formed on 27 July 1927 out of the merger of Berliner FC Vorwärts 1890 (November 1890), German championship runner-up of 1921, and Berliner Thor- und Fussball Club Union 1892 (BTuFC Union, June 1892), German champions of 1905. Blau-Weiß 90 spent one season in the German first division, the Bundesliga. History Predecessors Predecessor sides Vorwärts and Union were both founding members of the German Football Association at Leipzig in 1900. Vorwärts enjoyed early success with local championships in 1902, 1903 and 1921. In that last championship year, they also sent four players to the national side and played in the German final, which they lost 0–5 to 1. FC Nürnberg. Union took the national title in 1905 with a 2–0 win over Karlsruher FV. Immediately after the 1927 merger of these two sides the club was relegated from top-flight football in the city. The following season a third side, Arminia 1906 Berlin, joined the newly created club which started to slowly improve returning to the Oberliga Berlin-Brandenburg (I) in 1931. Within a couple of years German football was re-organised under the Third Reich into sixteen top-flight divisions with Blau-Weiss joining the Gauliga Berlin-Brandenburg. World War II and postwar period The club was sent down after a last place finish in 1937 but came storming back to win the division title in 1938–39. Blau-Weiß captured a second division title in 1942 and finished third overall nationally. After World War II occupying Allied authorities ordered the dissolution of all organizations in the country, including sports and football associations. The club was later re-formed as SG Mariendorf which eventually broke up into three separate sides: SpVgg Blau-Weiß 90 Berlin (re-established in 1949), SC Krampe Berlin, and SC Mariendorf. SG Mariendorf played first division football from 1946 until being relegated in 1948. Blau-Weiß re-joined the top tier Oberliga Berlin in 1950 where they played as a lower to mid-table side until finally being relegated in 1960. After three seasons in the Amateurliga Berlin (II), which included a division title win in 1963, the club secured a place in the newly formed Regionalliga Berlin (II). Once again a lower to mid-table side the club's performance improved in the early 1970s leading to a Regionalliga title in 1973 and a failed