Likely there were no metrics or all metrics but there would have been a handful of wrenches, a few screwdrivers some random sockets. You could start a job and carry that box in and get to work.
at 24 pounds empty i am sure it didn't take long to get past 50 lbs loaded and 75 or 100 may not be out of the question.
it took a real man to carry that in and out of his job every day.
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Back then you were able to carry it in loaded up....possibly not today with our "out of control" Health & Safety Workplace rules !
Nice Box and collection Steve !!