No 56 Fuze Mk IVC during World War I

Diagram of British No. 56 Mk IV C Time & Percussion Fuze, as used in the Second Boer War.
No. 56 was in service from 1894, declared obsolete 1921.
It was classed as a "Small T. and P. Fuze of G.S. Gauge".
Mk IV is a misnomer as there were no previous Marks.
The fuze fits a 1 inch "G.S" socket.
Single time ring, maximum burning time 13 seconds.
Listed in 1915 for use with shrapnel shells for the following guns :-

BL 15 pounder 7 cwt
BLC 15 pounder
BL 12 pounder 6 cwt
QF 12 pounder 12 cwt naval gun
BL 10 pounder Mountain Gun
QF 2.95 inch Mountain Gun
Mk IV* was similar except that it had .35 grains detonating composition for time portion instead of .2 grains.

By 1914 it was long obsolete but stocks still remained. Replaced by Fuzes No. 60, 63, 65.