Citizen were slightly ahead of Seiko in bring an electronic movement to market: the Citizen X-8 Cosmotron of 1967 was the first. Seiko's was the 3100 in 1968 / 1969.

The first group of photographs show some of the movements in the Citizen 7800 Cosmotron range: the 7802A, 7803A and 7804A. To change the date on these watches, you hold them with the dial facing downwards and press the button; to change the day, you press the button with the dial side up!

Photograph below shows the Seiko EL-310 (3703B) movement, launched in April 1971: