Color TV-Game 6 (カラーテレビゲーム6) — released June 1, 1977 in Japan only.
Funded Nintendo's R&D → Donkey Kong (1981) → Famicom (1983) → NES (1985). The TV-Game series proved Nintendo could mass-produce consumer electronics.
Today: CIB units fetch $300–$800; loose console $100–$200.