I had a look through Swedish Glass Factories to see if I could spot this design but no luck. It did confirm, however, my initial impression that this was early 30's by Gate or Lindstrand. It's very much in the style of the Java dancers that they did, although this isn't a Java dancer. Its the angles created at the joints that help to give it that look, as well as the bracelets round the wrists and ankles. This was the period when the demand for engraved glass started to drop (the depression), and Orrefors started to reduce the number of engravers they employed.
It's not Boda, where Hoglund did some work in the 50's, or Kosta, where Lindstrand went to create some famous engraved pieces in the 50, but which were quire different in style from his 30's designs.
I should say that this is in the style of Gate or Lindstrand, as I don't know enough to say whether it's one of their designs or by somebody hitching a ride on their wagon. Like Ross, I'm eagerly awaiting the wisdom and knowledge of Daniel.
David