Or, if you prefer, Franz Xaver Hüller or FX Hüller.
Helen's page on FX Huller is at http://bassic-sax.info/version5/vintage-saxes/european-made-saxes/f-x-huller/
Also, definitely check out the beautiful http://fxhuller.com website.

FX Hüller also made some stencils for Hammerschmidt" and CA Wunderlich. Be sure to check out those pages for some more pics.
Champion
Stencils
Stencils

Note that FX Huller also made some stencils for Paul Beuscher (France) in 1938/9. There's a nice picture from a Paul Beuscher catalog here.

World
World De Luxe
World Master
World Super