I just took a look in the new book I just got yesterday from Uwe Ladwig, Saxofone: Ein Kompendium, and the name doesn't appear in their other than in relation to what I already mentioned. This leads me to think that this might likely be a stencil, or possibly such an obscure brand, that it didn't come up in Uwe's research.
However, given what names did come up in during his 10+ years of researching the material for the book, I suspect that it's more likely a stencil. Sadly, the 2 pics are so small, that I can't make out any details other than: yup, it's a silver plated alto with a Hammerschmidt-like neck brace, a microtuner, & rolled tone holes. :-x