The spatial distribution of O-type stars projected onto the Per OB1 association has been investigated. From the limited data available we find evidence to suggest that there are several distinct clusters of early type stars in the association's line of sight. It is found that all those stars identified in the past as being blue stragglers are likely situated in the most distant cluster and consequently they are unlikely to be coevally related to the closer stellar groups. Our argument is that all those stars previously classified as blue stragglers in Per OB1 are ‘normal’ O and OBN stars.