If it is Flygsfors you'll most likely find that it is signed in full on the bottom. You'll also find that it has a white trail around the edge and the shape is much cleaner than any of the generic dishes out there - this is because they were designed.
This 1950s style pioneered by Flygsfors was very popular and triggered many companies to make these items. Among those various Murano companies, Empoli in Italy, Chalet in Canada, Luxval in Belgium, Leerdam (Meijdam) in Holland, Reijmyre Sweden and Bayel in France. I'm sure I forgot a few.
It would be good if someone (you?) could start collecting photographs of these and their stickers so we can get a clearer picture of who made what.