Dark purplish-blue mould blown vase with textured surface.
Polished and beveled rim. 16 cm high, 9 cm x 10.5 cm wide.
The first two candidates I thought of were Lindshammar (Christer Sjögren), or Wiesenthalhütte (Klaus Breit; they did have colour rather similar to this >> Link
). But I couldn't find a match...