It could possibly be Belgian, they like curvy shapes and the colour gold (though I've usually seen the gold as bands put on, rather than as flecks). As for other avenues of research, French glass got imported into Belgium a lot too.
Sadly, only one Belgian factory got ever researched, and I don't think it's from Boom. I've looked at the very few other resources I have on Belgian glass, and I can't find it, and it doesn't match a particular style of factory I'm familiar with.
Perhaps someone else has an idea where to look...
Astrid