A German artillery shell embedded in the armor of a Soviet KV-1 tank. It probably came from an early model Panzer IV, which mounted the Kampfwagenkanone 37 L/24 75mm tank gun, a low-velocity cannon mainly designed to fire high-explosive shells. The shell's profile matches the Panzergranate 39. It’s possible that the impact popped out the base fuse which stopped it from detonating. Note the ricochet mark from a prior hit just above it.