Both Citizen and Seiko toyed with electronic watches --- here are two of Seiko's offerings!

The first three photographs shows the EL-370 from 1971. It is probably the most common of the Seiko Electronic waches but, frankly, I find the styling of these two watches a little boring compared to other electric / electronic watches of the period; in fact, Seiko's calibre 6138 and 6139 chrono automatics from a few years earlier are much more interesting!

The last two photographs show the much rarer Seiko ELNIX from 1973. This had a frequency of 4 Hz. and features the 0702 calibre.