Hopefully someone will be along with the info you are seeking on the razor from an historical perspective. A photo of the whole razor scales and all plus a close up of any tang stampings would be useful to those with the knowledge to try and give you a time frame for the production. All I can say is that if the stamping says Sheffield and not Sheffield England then the razor likely predates 1890/91. Others are far more knowledgeable in dating razors.
Bob