That is a very cool and rare tank you have there. I never look in the planted nano section so I would have never seen this, but Radioman put a link in another thread. I wish there was more of those vintage tanks around. My dad used to have a vintage tank similar to that when I was young but his was a little bigger and really ornate. Is that all the original glass and slate bottom or has it been redone? By the way there is a replica of the tank you have on ebay for $750. Here is the item # if you want to check it out.
Item number: 120736334045