
The Illuminating Contents Mk 4 Mod 5 are used in this projectile, modified to use a lengthened spacer sleeve.
This projectile is identical to the 5 inch Illuminating Projectile Mk 48, except that the latter has a double rotating band.
No information about functioning.
Nothing else to see.
OP 1664, Volume 1 - US Explosive Ordnance (1947)