Hey Lawrence,
All I know is that their hog bristle filberts (love 'em) are made in France for them. The brushes have the 'Stevenson' logo stamped on them, but I've no idea what the names of the companies are that make their brushes. Had to go grab a brush to take a look-see, and this is printed on one side of the brushes : 'Manet-Soies Pures - France'. My knowledge of the French language stinks (it's been many a moon since Grade 8 French Class), so perhaps a more enlightened soul could tell you what this pertains to.
Take care,
Stefi