Judging from the photographs, you have an autronic eye system from a 1955 Oldsmobile. I am making this observation from the photograph showing the headlight bezel. There should be four main components, the large black box amplifier. The phototube housing on the dashboard. A power relay close to the amplifier. And a special separate floor switch to manually flashed a high beam headlights. An Oldsmobile only item is the special headlight switch. On the bottom of the phototube housing there is an aluminum tag, more than likely the first three numbers is 355xxxxxx the first number would indicate a division of General Motors. The second and third number will indicate the year. The remaining numbers is the production number only. To the bus my knowledge Packard never offered and automatic headlight to make system. But if anybody has any information or photographs I would be very interested to see them.
I broke several articles about automatic headlight dimming systems are General Motors offered. Here's my cellular number (815)-291-4384 thank you so much, john