Strombergshyttan ashtray

I wasn't sure who made my last piece of this fortunately Dav came to the rescue with a few others, but no need to guess with this one as it is engraved Strombergshyttan along with #83 (the year made?). Although mainly clear glass with a layer of black which seems to on the outside looking down it seems much more complex. 135mm across and as with the previous vase a weighty wee piece.