Septemvri starts the 1948/49 season in the newly formed A Republican Football Group, but only six months later is separated from Chavdar and removed from the division, with the current title given to CDNV, Chavdar's new name, which would ultimately become CSKA Sofia.
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In 1968, during another period of football reform in Bulgaria, Septemvri is again merged into CSKA Sofia.
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That same season, Septemvri finishes in 5th place and claims the Bulgarian Cup after a dramatic 4:3 win over Lokomotiv Sofia in extra time.
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In May 1948, the club, then playing in the 1st Sofia Division, is briefly merged with second-division Chavdar (Sofia) and the unified club wins the 1948 Bulgarian Championship by overcoming Levski Sofia at the final.
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