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.
You might notice that I'm posting a few horns in here that are actively for sale.
I'm doing that for a few folks that have been long-time contributors here.
The standard disclaimer applies: they're not my horns, I don't claim they're good or they're in perfect shape, etc.
If you want to list your horn, e-mail me at thesaxinfo-at-gmail.com and we might be able to work something out.