Sadly, its not as unique as it looks. I stumbed across a very similar piece at another headshop about 6 months after I bought this one. (similar enough i can just about guarantee the same person blew it.) the green was replaced with red. The colors were a lot nicer, but the quality of this piece is much higher.
favorite piece. got it for free because it has a teeny tiny crack on the inside of the outer chamber. the guy gave it to me because it was "defective" I've had it for 3+ years and it kicks everyones ass the first time.
Purchased in 2006 at a smoke shop in Venice Beach California. Inside out glass with a huge bowl. 7 inches long. Smokes very smooth and is extrmely thick. One of the best peaces I've ever tried. No bullshit!
This one surprised me because when I bought it the color was amber and I wasn't sure I wanted to buy it because I wanted a blue one. It turned out to be a color changing piece and I got the blue pipe I wanted. :)