WW1 'Periscope Prism company' sniper scope???

[Madzi]

The Glew radium tubes in Roger's first document would have been for the brass night sights fitted to the SMLE, I would assume? I wonder who had the contract to make those? (Those are mentioned in James Anderson's journal, so one of my Holy Grail items, if anyone spots any going...;-). For the second doc, I've got quite an interesting (unfortunately interwar, so not the one) Henzolt-Wetzler, which has the same tube dimensions as the M1918 - (shown here with M1918 mounts, and next to a Fuess 5 for comparisome, but focusing ring disallows straight use of the mounts). Pretty sure that would have the same "parent" as the M1918.