Oldest newscasts I have:
KABC from 65
WMAQ from 67
WTLV from 72
WAGA from 79
WXIA from 80
WIIC (now WPXI) from 80
The two oldest newscasts I recorded myself (and still have the Betamax tapes - and machines - for):
KCEN/6/Temple, TX from 87
WMAR/2/Baltimore from 87 (station's 50th anniversary, but includes a segment on the NAMBLA convention that Baltimore was protesting being held there...)
WTVJ/4/Miami from 12/21/88 (the night before the station switched from CBS to NBC)
The WTVJ was intentional, as it was the late night rebroadcast (minus the end), but then leads into the movie "Saturday Night Fever" with the "official switch" announcement during the middle of the movie (at like 2:20am).
KCEN was "semi-intentional" - I was recording NBC's Thursday night lineup, and the tonight show, but my original VCR only had a 1-event tuner, so I ended up with the newscast...
WMAR was intentional, since it was the night of their 50th anniversary (just a short piece on the news...)
The older ones are from the trading circuit; I have a few other older ones on VHS, but need to find them in the masses of tapes...
Jim