Please help identify silver hallmark on Viennese pocket mirror, maker's mark „S.G“

[Gerox]

Hello All,
There is a nice Viennese pocket mirror, silver hallmark: Republik Österreich ab 1922, Hoopoe head 2= (silver fineness .900), Austria Assay City Letter W = Wien

Does anyone know the maker's mark “S.G“???

Any help would be greatly appreciated. Thank you!

Gerox