Ivo: Thanks for the reference to Gateway to Glass: great pics and a useful article.
I'd noticed the similarity of the crescents and moons on your piece to the Jan Johansson piece. One is pictured in Orrefors: A Century of Swedish Glassmaking, p. 153. However, it states that they were made as part of an Expo edition (of either 100 or 200 pieces) in dark blue, green or amber. No clear.