I bought it at a flea market and I polished and sharpened it.
I use it shaving the mustache and against the grain for its size.
1920?

Name: Koller3.jpg Views: 104 Size: 29.5 KB

Name: Koller2.jpg Views: 96 Size: 31.5 KB

Name: Koller.jpg Views: 116 Size: 38.5 KB