It's also vague, by early 77 it probably means 76, when the 77 model began and changeover taking place. Not sure why they seem confused that Olds blue had a different code to Pontiac blue in the per-corporate days, since both had their own blues, the engines were built and painted elsewhere, then sent where needed. It wasn't a case of paint this one in Pontiac blue, since it was an Olds factory with Olds paint on the shelves, which at that time was a metallic blue also.