I found a site showing the factory brocure but there were no copper colored convertibles in it.Maybe you were thinking of this advertisement which shows a convertible in a gold metallic color:
Thats the car. In the 67 Dart brochure, its the same car, almost the same camera angle, but the passenger door is open and the girl is leaning on the Dart's trunk. I have both the ad and the brochure (but no scanner so I can't post it.
