My rough translations of the photo captions, from left to right, are:
I think that these labels are probably the wrong way around!.
Hiroshi Nakamura, writing in Cycle History 11, shows the Speed-X as being manufactured by a company called 'Saito'. However, these pictures clearly show it branded as a Fuji product. The lever is labelled 'The Nichibei Shoten Co.' - which is the name of the company that owned the Fuji bicycle brand.