That looks to me NOT like a "light blue" demo copy, but rather, a black on pure white demo, whose colour looks a bit grayish, caused by the scanning process. My black on white DJ copy looks like that. I've never seen the blue one, and never seen any Chex Record without a stamp, and with "Chex" scratched on. I've seen many Jay-Gee distributed issues on the cream-coloured block lettered Chex. But they all had a stamp (Sheldon?), and also the record number etched on, and no "Chex".