National Geographic : 1970 May
The Electronic Timex. It's powered by a tiny replaceable energy cell that lasts a whole year. It's 99.99% accurate*. It never needs winding. It has an automatic calendar. It's transistorized. It has a jump-sweep second hand. It's water-resistant. It's dust-resistant. The Electronic Timex . It never needs winding. Model illus.: 99041 *Regulation may be necessary to achieve this accuracy.