It was an English limited overs county cricket tournament which was held between 5 and 16 September 1990.
The tournament was won by Middlesex who defeated Derbyshire by 5 wickets in the final at Edgbaston, Birmingham.
The counties finishing in the top four of the 1990 Refuge Assurance League competed in the semi-finals.
Winners from the semi-finals then went on to the final at Edgbaston which was held on 16 September 1990.
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