1974 Zenith F420W2 clockless clock radio

As seen on the cover of the service manual, the Zenith F420 is from 1974 and is a radio-only version of the F462 clock radio: http://www.mikesmanuals.com/Upload/zenith_ra70_f420_f460_f460-4_f4_am_fm_clock_radio_service_manual.jpg