Very nice work on the Frameback Pradat- Brun. The first registration trademark for the Pradat- Brun firm came in 1904, with the name Pradat-Brun and the logo of a shaving brush (blaireau). Mr Pradat was involved in others cutlery association before this registration.
Attachment 127400
It was 4 years later 1908 that the Pradat-Brun registered the "England Barber" trademark.
Attachment 127401
Perhaps this helps you in dating this razor.
Attachment 127403