
Fuze M507 is a dual purpose (superquick or delay) point detonating fuze for use on HE Projectile M73 fired from the 120mm antiaircraft cannon.
No information about functioning.
MIL-HDBK-146, Fuze Catalog (1982)
TM 9-1300-203, Artillery Ammunition (1967)
TM 9-1385-51, Ammunition (Conventional) for Explosive Ordnance Disposal (1967)