I've picked up a ratty old full 50 box of FP4+ for basically nothing. The base is thicker than the current FP4+, it has only a single big U-shaped notch in the corner (instead of the code used on present FP4+), and came inside a waxy-feeling paper. The film sheets are separated by Kodak-orange coloured sheets of thin paper.
Now that I think of it, it might be FP4 and not FP4+ (I can't remember if I actually saw a +).
Any hints for development? Same as current FP4+?
I've loaded up 12 sheets in my frankencamera and I'm planning to use it for pinhole stuff.