HarbingerX
Rob Of The North
It was the old Blue Book edition.
Blue-book D&D
Blue-book D&D, p.n. 1. the 1974 edition of TSR Hobbies, Inc.'s Dungeons & Dragons Adult Fantasy Role-Playing Game. 2. D&D as played by this basic rules set. 3. a D&D game with characters below 3rd level (the bluebook rules only covered characters through third level - more advanced players moved...gamerjargon.fandom.com
Now more commonly known as Holmes D&D, and published in 1977. That wiki entry is really wrong. The 1974 D&D is normally called the 'White Box' D&D or Original D&D.