I'm not so sure that your piece is an ashtray - it doesn't have the expected cut-outs in which to lay your 'fag'

An example is showing on page 127 of the Vigier & Pina volume 'Scandinavian Glass 1930 - 2000 Smoke & Ice' - where it's described simply as a cast bowl. Should have a side measurement of about 8.5" (21.60 cms.), and would originally have had the factory black and white label.
Regret I'm clueless as to the current popularity of Swedish glass, so no idea of market values - and as you may know, what is of value to some people may be considered far less so to others, and for these reasons folk here will not usually give values for glass. Ebay of other sources for collectable glass may be your best bet for some indication of value.
Having said that, the above book, like so many States produced volumes, does in fact give - what at the time of publication may have been seen as a fair market guide to price. Before I break any GMB rules, can someone say if it's acceptable to give book information of that nature.

Apologies if this seems pedantic.