I last used the darkroom loads about '61.I remember them, but I was always too idle to be bothered with them and used factory cassettes.
They came with a long leader hole punched with eg HP3 so you knew which film type for the speed reminder.
There was a more than one type eg a daylight load ie a film and spool wrapped in paper cassette!
But
https://en.m.wikipedia.org/wiki/135_film
Please can we limit nostalgia threads, seems like yesterday.
