No serial number, no patent, no branding of any type. It is a single ring and looks like Gillette Old Type and possibly silver plated. There is slight patina in a few places, but overall the condition is very good. The case is plated and has a light brown felt lining with no branding.
Is that head flatter than a Gillette's? It appears not to have much of an arch... Like a German razor I have, also it has widely spaced teeth like mine. Could it be a Standard? Made in Germany?