Kumquat, Ive had a little dig through some of my books in an attempt to identify your bottle, and uncovered a little more info.
Youre probably aware Master Craftsman Heinrich Hoffman was responsible for some of the most striking Czech perfume bottles in the 20th century. He worked in an atelier in Paris and put his ornate bottles in production in Eastern Europe. Hoffman also contributed to the glass making ventures of his son-in-law Henry Schlevogt which resulted in the beautiful Ingrid range of bottles. (These are the ones that typically feature complex agate, marble and stone finishes). They are in fact made of crystal.
In a book I have here, Perfume Bottles by Judith Miller, it depicts a turquoise crystal Hoffman bottle, with a motif identical to the figure on your bottle, whose value is in the area of $4000 and up! You can see that one pictured in this link
Here are a few photos taken from the book (apologies for the photo quality)...
If you visit this link
and scroll down a little, you will see some smaller Ingrid malachite bottles, whose estimates are around the $2000 mark, so I think you found a WONDERFUL bargain when you made your purchase!
Enjoy it and treasure it!