Very cool.
Here it is on a Japanese web page (scroll down a bit). And the crappy Google translation:
Translation: Japanese » English
純正ではクランク一体型のシングルギヤが付いています.クランクは軽合のようですが,ギヤは鉄製でカシメで付いておりギヤの交換は出来ません. SUGINOのHPを見てもこの手の製品は載っておらず,すでに製造中止されているようです
Clank is genuine and lower body with a single gear. Crank case, but it is light, gear, with the iron in KASHIME gear and can not be exchanged. SUGINO HP's look at this kind of product Is not listed, already have been discontinued.