Description 40 mm all-up round for Bofors gun. Casing is brass. Shell and fuze are painted steel. Rotating drive band is copper, and does not have any marks from having been seated into a barrel.The fuze cap on the shell is painted red (tip) and yellow (band), signifying Incendiary / Dark Ignition Tracer. The body is painted green, signifying High Explosive Filler, possibly with a black band (which would indicate no self-destruct relay in tracer element). Primer appears to bear firing pin impact marks. Rotating drive band is marked: Mk 2-5 Lot 1846. Casing base flange is marked: 40 MM Mk 2 3 - 45 NES Lot 1.5.8 Primer is marked: Mk 2 2-1 L T 4345 UR4 - 4 5