The Guillermo and Guillermo Hoppe razors were made by Wilhelm Hoppe and Co. This razor has the Wilhelm Hoppe logo below the Guillermo Hoppe tang stamp. I don't recognize the logo on the other side of the tang. I've also seen Guillermo razors with the Henckels Twins logo.
Timo, that's a real nice razor. Mine is almost the same model. I found it in NY and got it for next to nothing, although you can see mine was somewhat more used. It appears that the tip is muted by design. I got it all cleaned up, honed up and used it for the first time a couple days ago. A heavy, large blade and fine shave. A definite keeper.
Telly, what was the WH Co? Did they commission these razors from Henkels?
I picked up a Guillermo Hoppe 14 on ebay as well. So far it is my best shaving razor. It is a J. A. Henckels marked razor. Pictures are in this thread.