 Dunav played in the A Group over a number of seasons between 1937–1940, 1951, 1956, 1958–67, 1968–73, 1974–77, 1984–86, 1988–91 and 1996–98, before being relegated again.Following years of several movements between lower divisions, a decent squad, established by playing manager Engibar Engibarov at the time, eventually won the Cup of Bulgarian Amateur Football League in 2003–04 and for the next season they finally gained promotion to the B PFG after a long-term absence in the amateur divisions.It was to be their first appearance in professional football since the club was relegated from the A Group in 1991.