Pacific time in the '50s was a real hodgepode even after the
coaxial cable linked the two coasts; for example, KPIX San
Francisco would show "Arthur Godfrey's Talent Scouts" live
from New York on Mondays at 5:30 (PT), while KNXT (KCBS)
Los Angeles would delay it three hours to 8:30. AFAIK, the
networks eventually put the West Coast on the same primetime
as the East, although ABC would do some crazy things on Saturday
nights in the early '60s in order to accommodate "The Fight Of The
Week" and "Make That Spare," which, by necessity, aired live. A
typical 1961 Saturday-night schedule would look like this:
6 PM Lawrence Welk (live, 9 PM ET)
7 PM Fight Of The Week (live, 10 PM ET)
7:45 Make That Spare (live, 10:45 ET)
8 PM Matty's Funday Funnies (7 PM ET)
8:30 Leave It To Beaver (8:30 ET)
9 PM The Roaring 20's (7:30 ET)
the affiliates then getting 10-11, the equivalent of 6:30-7:30 in the East.
As for the Mountain time zone, the farthest back I've looked is Denver in 1967.
ABC affiliate KBTV (now KUSA) stayed with the Central time zone Monday-Friday,
but on weekends would take the live feeds from the East:
Saturday: 5:30 Dating Game (7:30 ET)
6 PM Newlywed Game (8 ET)
6:30 Lawrence Welk (8:30 ET)
7:30 Hollywood Palace (9:30 ET)
then pre-empt "ABC Scope" at 8:30 MT/10:30 ET)
Sunday: 5 PM Voyage To The Bottom Of The Sea (7 ET)
6 PM The FBI (8 ET)
7 PM ABC Sunday Night Movie (9 ET)
then get affiliate time 9-11 MT, the equivalent of 5-7 ET
CBS and NBC in Denver played a little more fast and loose with their networks;
a number of shows which aired early in the East might air later in the Mountain
time zone; I seem to recall "The Man From U.N.C.L.E." as a show which aired at
8 (ET) but not until 9 (MT). Like ABC, the other affiliates carried their networks
from 5 or 5:30 to 9 PM on weekends; I recall only "It's About Time" (CBS, Sunday 7:30 ET/
5:30 MT) airing out of pattern in Denver.
I think somewhere I posted either a Mountain or Pacific (or both) schedule for November
22, 1963, what had been scheduled before the events in Dallas. And I'm quite sure that
ABC followed a 6:30-10 primetime, although "The Fight Of The Week" and "Make That Spare"
might have aired in the 8-9 slot.
Now as to whether these shows were fed from New York, or possibly Chicago, and tape-
delayed I can't answer. I can only say that Denver's Ch. 9 was more orderly than Chs. 4
and 7 in its scheduling (same in daytime, which started with "Dateline: Hollywood" at 8:30
MT/10:30 ET and continued through "The Dating Game" at 2 PM MT/4 PM ET).