This a home photo printing toy that combines the functions of projector, rear projection screen, and enlarger.
I believe it used photosensitive paper similar to early 3M "dry copiers".
It would probably work with cyanotype (sun print) paper - I haven't tried it.

Seems to be complete except for the instructions and print paper. The projection lamp lights up.
There is a negative / slide carrier and a paper carrier. The viewer portion is a rear projection frosted screen with a mirror behind.
The mirror pivots out of the way so the paper can be exposed once the desired image is on the screen.

Packaged in original box and cardboard inserts. About 15 lbs, but expect oversize shipping surcharges.