The 12 OUCD movement is of the
Fixed Coil, Transistor Controlled Balance variety and is
the same as the Citizen 4830. Both movements are related to
the
ESA Dynotrons (9157, 9158). In fact, you can clearly see the "LIC. ATO" on the
12 OUCD plate below; this acknowledges
their technology inheritance with the Dynotrons.