ZEPP, Safe Razor Co.
It's very difficult to say for sure who made these razors.
Several companies were the owners of ZEPP trademark.
Here is ZEPP razor by Timothy Noonan & Sons, Boston.
All razors are stamped "Germany" or "made in Germany".
Carl Friedrich Ern, Solingen-Wald was also the owner of ZEPP trademark.
Possibly, his company made these razors for American market.