This investigation is carried out within the framework of a project including a search for spectral individualities characteristic for members of certain clusters and associations, with the ultimate intention to find a reasonably reliable physical parameter useful for discrimination purposes. Inevitably the problem of chemically peculiar upper main sequence stars (CP stars) will then also enter. A more detailed description of the project is presented in a previous paper by the present author (1983) about a study of the Ursa Major moving cluster. Three stellar groupings are included in the investigation: the well-known cluster NGC 6475 (M7) and a pair of suspected loose clustering earlier listed by the author, L 89 and L 565. At this preliminary investigation the cluster is to be considered as the principal object and the other groupings as comparison ones.