
Fuze M56 is a super sensitive type used with 37mm high explosive projectiles.
No information about functioning.
Nothing else to see.
TM 9-1300-203, Artillery Ammunition (1967)
TM 9-1385-51, Ammunition (Conventional) for Explosive Ordnance Disposal (1967)
TM 9-1904, Ammunition Inspection Guide (1944)