The box with a strap is made of wood and it contains a battery. Normally the top is hinged and there is a notched out place on the side in case multiple batteries are needed to be connected together to booster amp hours or to jump the combined battery from 6v to 12v (or whatever the application).
Some have a fitting in the front that is hard wired to the terminals on the battery inside the box so you can plug in and unplug easily without having to so anything inside the box.
Bottom line of the photo before my reply shows where the box would have indicated voltage (blocked in the shot) and then the amp hours the battery would provide. That one is also a post war box which is a surprise to me as I thought this system was only WWII and early postwar. Not well into the 1950s as this box looks like 1959.
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