Vintage Sawyer Pana-Vue I 35mm slide viewer No. 2573 in original box. Lighted 2x2 slide viewer for wide-screen viewing of 35mm 828 Bantam and Super Slides. 

In good vintage condition, including box. I have not tested to see if it works because I don't know how! If you'd like me to check anything, just ask and I'm happy to investigate.