My thanks go to John Massegee in the USA for these photos of his 1977 Gamma. John writes:
... I happen to own a 1977 gamma, Ive been trying to find out more about it and stumbled on your site. your info on the site offered clues as to why the placard in the car reads "coltons carriage"
but some info is incorrect as I have the car and a few other things. i also have much better photos as well if you would like to use them on your site that would be fine with me.... so long as you would also share any info you have on the car, or contacts that might help in my quest, i would be very grateful.
Here's a link to my flickr page...(more photos there)