Got my hands on another model 101 (green/red) Century from Lava Lite. Thanks to Bill for the confirmation and nudging on this one! I'd seen it on eBay, but wasn't sure if I should pull the trigger.
Of course, it has some issues - the wax won't stay on the coil and eventually just hangs out at the top. And the wax has that white powdery stuff around the bottom, too. So, lamp surgery will be in order soon. Liquid is pretty clear though and you can still see the green tinge to the liquid color!
This is my 2nd model 101 - the first one I restored (mostly), but wasn't able to use the liquid (but I still have it). I hope this one turns out better - I really don't want to screw this one up!