Hi, Arsenico!
Thank you for this information. Is 100% more information than I had!
We had an enormous influx of Japanese citizens in Brazil after the food crisis after the end of Tokugawa Xógum. Probably this razor was brought to Brazil at this time. I found it at a flea market not far from the Japanese neighborhood at Sao Paulo.
Would be nice to track its age.

Thank you very much!