the true spirit was the precursor to warlock. did they tweak it a bit and come up w/warlock. i've seen only 2 different color true spirits and both were different body's a utiline(all were same color) and a sweptline(was blue). the swept didn't have the striping.
i have sales and dealer lit and nothing is mentioned about warlocks or true spirits in dealer order books. so hard to say. warlock is mentioned in sales brochures for 77.
don't have much before 76 as far as dealer stuff.
here is a pic of a 79 TS, notice stripe similarity.