I agree with the others. I've seen an original in the car before. Guy came to a show with his ORIGINAL, documented Ivy Gold coupe. Came from the factory with fog lights, disc brakes, pony interior, rally pac, 4 speed, 289 2bbl, vinyl top, and stereo system with reverb.
I'm not sure about those being "original" but I could be wrong. I had one put in my car in high school (mid '60's). I put one because it made my AM radio sound like "stereo". LOL There was a rheostat that you could adjust the "vibration" of the unit. All the way up and you could barely understand the words. : /