...the guy I bought it from was an enthusiastic restorer...
I suspect the stick was supplied by an outside contractor rather than the Grenade maker.
The internals are in better shape .
This was the case. For interest the suppliers of cane handles were:
M. Jacobs & Co., Tabernacle St, London EC - supplied Edison and Swan.
Slazengers Ltd, Cannon St, London EC - supplied Oliver Arc Lamp.
F. Restall, Great Hampton St, Birmingham - supplied Bulpitt and Sons.
I suppose that poses the question "Who supplied the Royal Laboratories 1908 - 1912 and after 1914?"