British WW1 pattern artillery fuze.
Fuze, Graze, No 100 IIB. Impact fuze of a type fitted to a wide variety of High Explosive filled artillery shells early in WW1. Designed, tested and approved in only 10 days, its wartime record was not good. Superseded by more reliable types due to safety issues. A rare steel bodied, copper plated example, manufactured by R.M.C. Co. of Canada. 1916