Your lens is pre-AI, but it has been properly converted to AI by Nikon, so should be safe to mount on any Nikon camera.
The original lens does stop down to f22, and the range f1.4 ~ f22 is the largest from any Nikon lens - it is one more in both directions compared to the Nikkor-O 35/2 made at the same time. I think early AI cameras could not handle such a large range so when Nikon made the AI conversion ring, the range was reduced one stop so it only goes to f16.