Your razor was retailed by Sanda Cutlery and was made in Germany by an unknown manufacturer probably sometime between the world wars. During these years Germany was flooding the U.S. with inexpensive razors which were stamped with the retailer's name. Hardware stores, barber supply companies, cutlery outlets, department stores, etc. etc., all had a personalized line of razors to sell. Quality varies since the same retailer could be getting razors from a variety of sources. But, most are very good shavers.

Regards - Walt