电子钟表（房子、火箭、书）（Electric Clock ("House", "Rocket", "Books")）（N&B Block NB 1480EC-H、N&B Block NB 1480EC-B、N&B Block NB 1480EC-R）

In 1971, Nintendo introduced a number of electric clocks in a series called E-clock. At around the same time, they also released three self-build clocks in the Nintendo Block series. These are the Electric Clock (電気時計) sets "house", "books" and "rockets", with product codes NB 1480EC-H, NB 1480EC-B and NB 1480EC-R, respectively. They include a working clock element, running on mains power.