It's a traffic light viewer and I had one on my 55 Chevy because of the sun visor and it worked very well. They are very Nostalgic also which makes them fit nicely on Hot Rods/Classic.

https://www.google.com/search?q=dash...EQQsAQ&dpr=0.9

http://i201.photobucket.com/albums/a...psfp8oukgh.jpg