Second Generation Z clocks
The second generation clocks, 1974 1/2–1978, was a new clock and supplied as the standard in Zcars. Kanto Seiki built these clocks and subcontracted to the Rhythm Watch Co. Japan for the new mechanisms.
Changes from the first generation included the clock housing , mounting bracket, front bezel, connector, and internal mechanism. The second generation clock movements were a remarkable improvement over the first in reliability and accuracy. A hybrid by design it married the solid state technology of the day with a mechanical clock movement. Clock speed adjustment is accessed through the rear of the clock housing and near impossible to adjust in the car.
In 1977 Kanto Seiki changed the clock face plate number(s) to a rounded appearance which continued through 1978. See clock face plates below.