According to an article by Norbert Klups in DWJ 11/95 this was a joint development by Wolfgang Romey for Gehman and Westley Richards. It is based on the 7×66 SE necked up to .375 (9,5mm). The idea was to create a standard length action cartridge with ballistics exceeding that of the 375 H&H. The project did however not seem too successful. (Dixon Ref. W78)

No longer produced, below is the British version the 9.5×66 Vom Hofe. The 375 designation was requested specifically by the British as that is the minimum legal caliber for hunting dangerous game in Africa so the headstamp should reflect that.