As I understand they imported from several countries and other import companies as incazzatonero mentioned below.
There are two reasons for my suggesting Eastern Europe;
1- the egg itself looks like other eggs I have seen coming to market in Germany, admittedly not with this specific engraving.
2 - it's marked "foreign" -Wuidart labelled at least some of their Swedish wares "Made in Sweden" -
http://www.glassbudvases.co.uk/wuidartlabel.htm.
Why not use the "Made in Sweden" label if it was? Using a "Foreign" label in the 40-60'ies suggests Germany, Eastern Europe or Japan to me.
You might want to have this moved to general glass for some of the experts on Czech, German etc glass to take a look.
Please note I'm not saying it's definitely not of Swedish origin, it could well be Swedish, altho I personally think not.