What are these metal balls, hanging from chains, on the back of this tank's turret? : r/whatisthisthing

For the identification of mysterious objects

What Is This Thing?”: 50 Times People Stumbled Upon Mysterious

Metal ball with raised patterns. Has rivets on ends like it's sealed

What Is This Thing?”: 50 Times People Stumbled Upon…

What is this leather bag, designed to attach onto belts (or the like

Something made out of metal. The top part can be screwed off, but

Something made out of metal. The top part can be screwed off, but

For the identification of mysterious objects

These small metal balls came out of the back of a customers truck

Found this metal sphere in a box with some other stuff. Two parts