Hello;
The "Maxy" cranks were made by Sugino. "Maxy" was cheap model in Sugino's line-up. "Maxy" was 3 arm crank. Right-hand crank arm attached to spider. Not solid. The "Super Maxy" were succeeding models from "Maxy". It was still a cheap model and not-solid crank. "Super Maxy" have some variations. 5 arm (model name "Super Maxy MJX" 144 mm BCD), 5 arm (model name "Super Maxy DJX" 110 mm BCD) and TA style 6 vis (model name "Pro-Dynamic Maxy"). "Maxy" and "Super Maxy" were equipped for popular bicycle in their age.
*Sugino web site
http://www2.odn.ne.jp/
Kenji Fusejima
Tokyo Japan