Box for Cougar (76mm) plumb bob
We had that box issued issued as part of the EIS of the Cougar AVGP that mounted the Scorpion turret. IFIRC that box held the plumb box for indirect shooting calculations.
They were excellent for keeping your chicklets handy and your matches dry. We never used the plumb bob for indirect shooting but it was something we learned on the gunners course.
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