I have come across this unusual visor face mask. After hours researching what it could be all I’ve found was an image of a similar mask from a book - ''Helmets and Body Armor in Modern Warfare'' by Bashford Dean (brief information can be found on page 131)
‘’numerous experiments were made by the British in the direction of producing a shield for the face. One of the earliest forms, so far as the writer has learned, was devised by John Berkeley of Newcastle and is shown in fig. 88. It was merely a steel plate which fitted under the peak of the soldier’s cap and was pierced with vertical and transverse slits in front of each eye. This design is only one of many which never passes beyond experimental stage. We should, however, mention a fairly good eye defence produced in steel in 1916, which had a considerable sale among English soldiers.''
looks like the eye slits are different, but could it be indeed, one of those early experimental model of British face defence 1915-1916, as according to the book ?
link - https://books.google.co.uk/books/about/Helmets_and_Body_Armor_in_Modern_Warfare.html?id=8SvEBQAAQBAJ&printsec=frontcover&source=kp_read_button&redir_esc=y#v=onepage&q&f=false
Any information would be greatly appreciated!