I agree with Joe Young, that your Golden Demonstrator, should be a 1970, Butttt, CASE was nortorious for using up inventory, etc.
I as a CASE dealer in the mid 70s, were repainted and repowered many 770-1070s with industrial 336T skid engines which we purchased from Sand Hill Equipment, in Bassett NE. The 970s and 10s, we bolted on manifolding, and oil coolers from the 1175 tractors, and modified the air intake systems, with increased sized filters and Turbo II intake systems. We then painted the tractors, from anything from Demo's to "Stars and Stripes", to my favorite which was a 70 Series with white sheat metal and a black belly with custom decaling. When I get a chanch I will post a pic. (don't hold your breath)
I threw in a pic. of our 71 770, not a GD. (for you who know, the cab is not original to it. It came off a 77 1070. The 770 was an open station 8-speed.
We as a dealer ordered a Golden Demo 870 PS CAB in 1970, and an 870 Black Knight in 71. My good friend, a neighboring dealer ordered 1070s and a 1470 BK which came to him with all the paperwork, but it was a standard 2 tone. Between the 2 of us we sold 9 "DEMO" tractor 870-1470, including 970s, and the 1170 BK,(Mel, that one came from your home 20), but no 770s. We were able to transfer them in from other dealers who hadn't sold them during the floor plan period, or were willing to let them go.
You can get further info from Rich Torwick a CNH. Sorry I dont have his e-mail handy at the moment. I'm sure someone else does.