Here is a vintage slide viewer by Cenei
This is the Scoper G1 made in West Germany
Requires 2 batteries, includes the light bulb. (I'm not sending it with batteries)
I tested it and it still works!
In case you're unfamiliar with how these work, you insert a single slide and as you push it into the viewer, the cardboard pushes the light bulb holder, causing the bulb to light and illuminate the slide
Buy from a trusted and
reliable seller. I source my items from thrift stores, estate sales,
auctions and yard sales. My home is non-smoking and pet friendly, but I
cannot speak for their original homes.