Two new Zeniths

I live about midway between Youngstown and Pittsburgh, and am about 35 miles from each one. In this area, I have seen TV sets made as far back as the mid-1950s equipped with factory UHF tuners; we had an old Zenith which had one. Zenith evidently had UHF strips available for their older sets at one time; I have a Zenith 28T962 porthole set from 1949 which has a UHF strip installed in its massive "cement mixer" tuner. Of course, the switch-type tuner used by RCA in the 630 and subsequent sets left the setowner with no choice but to add an external UHF converter.