The IBM 650 is a decimal computer made from vacuum tubes in pluggable units with magnetic drum main memory. The basic system consists of the computer itself with a front operator panel, the power supply which is the same size but featureless and the IBM 533 card reader/punch that was the input/output device.
Here are more views of my 650.
Here are views with the covers removed.
Larger 650 installations had a printer and tape drives.
My 650 is missing most of the buttons and lights on the front panel. You can see a few remaining rotary switch knobs and light bulbs. The rectangular openings had buttons and lights similar to these:
