I've had this stashed away in my garage for several years snd until recently had not been able to find out anything about it:
It is a scrolling checklist for the C-46 aircraft and No idea when this was made, but the US Air Force used the Commando through 1968.
It's a plastic box with two spools for each end of a long paper strip with the check list printed on it. I have seen references to some of these having a typed check list. The script is black and white but is viewed through a red filter.
Here's what it looks like without the filter. Note the alligator clips connecting this to a power supply. I used 15 volts, but being an aircraft part, I presume the lightbulb is rated for 24 volts. It could use more power than 15 volts provides.
Here's a YouTube movie showing it in action: