Collin speculum are much used, in some countries they are more used then in other countries,
students learn by example the Graves at the medical school, in there professional time they use them also.
In Holland at the University of Health they use Seyffert, Cusco.
In the clinics and hospitals they these speculum's also, by procedures like IUD biopsy abortion they use speculum with a bigger view like Collin.
In Belgium and French Collin speculum's are more used.