Yes we had it too*, and I knew exactly how modern and technologically advanced it was because I found a tracing of a diagram of a crystal in one of my dad's old chemistry books from when he had been at that same school and the square was as far as I could tell exactly the same size/shape as the present-day ones, and I can't remember if I checked but I'd be surprised if the perforations weren't an exact match.
* rolls at school, I remember the boxed variety from older relatives, not sure which was harsher, but at least the boxed one wasn't pretending.