I picked up a 30 today that has a half system fitted. The can says it's a "supermonkey". The system is mild steel and looks different to most of the other systems i've seen.

Anybody heard of them?

Most likey one of the old jap systems, some of them did have some swanky names

You sure it's not just a can that was intended for a monkey bike??

The monkey bike scene is insane in Japan!