[Electronic M]

UHF was typically an added cost option before 1964. Usually the rest of the set was normal, just UHF was added. Most cabinets had provisions for mounting the tuner. If you lived in an area with local UHF (especially some UHF only markets where VHF wasn't recievable) EVERY TV sold in that region would have UHF...The stores would be smart enough to realize sets wouldn't sell without it and would order it on every set...Distributors probably knew not to deliver VHF only sets to those stores in those market areas either.