
The fuze has no detonating element, as it is designed to ignite the base charge of black powder in the shrapnel. If the time element of the fuze fails to function, or the setting is too long, the percussion element will cause the shrapnel to function upon impact.
Dummy fuze is the M42A1.
No information about functioning.
Nothing else to see.
MIL-HDBK-146, Fuze Catalog (1982)
TM 9-1904, Ammunition Inspection Guide (1944)