Very cool.

I've read Suntour Mountech was technically a really cool, well-working derailleur, the top pulley is on it's own spring or something like that, and though it works great in the lab, it was sealed poorly and would easily get gunked up which is of course bad for a mountain bike derailluer. It makes sense since that bike's got a triple, apparently they are good touring bike derailleurs. I dunno if it would be original but it could handle really big gear ratios thanks to the floating pulley.