Premise: The 1977 Gillette Cup was the fifteenth Gillette Cup, an English limited overs county cricket tournament. It was held between 29 June and 3 September 1977. The tournament was won by Middlesex County Cricket Club who defeated Glamorgan County Cricket Club by 5 wickets in the final at Lord's.
Hypothesis: The fifteenth Gillette Cup was help in 1977 between the months of June and September.