Most likely, your razor was made by Gustav Melcher Sohn.
The company was founded by Gustav Melcher, Ohligs-Solingen in 1883.

Your stamp:


But there was another company with the similar stamp.
C. Friedrich Kratz & Co, GMBH Rasiermesserfabric und Hohlschlieferei, Solingen-Wald was founded in 1890.



But even so, your razor stamp is closer to Gustav Melcher Sohn. IMO.