WTVJ originally signed on the air on March 21, 1949, as a primary CBS affiliate and the first television in Miami–Fort Lauderdale and in the state of Florida on channel 4, and was originally owned by Wometco Enterprises (ran by the Wolfson family), hence the call letters originally stood for "Wometco TeleVision".
1953 ID Slide
1953 ID Slide
1953 ID Slide with cutout for various messages
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This logo retained the "4" design of the previous logo; only in a rounded square instead of a circle and the callsign underneath set in the ITC Bauhaus font. This logo would often be shown in an italicized format (often on intros for the station's newscasts). It continued to be used even after NBC took control of the station until October 1988.
WTVJ, along with other stations that were owned by Wometco, was later purchased by Kohlberg Kravis Roberts in 1984, and would later put the station up for sale in 1986. Then, General Electric, NBC's corporate parent, purchased WTVJ in September 1987, making it technically the first station in Miami–Fort Lauderdale to be owned by a network (after CBS' multiple failed attempts to purchase the station, but would later purchase then-Fox affiliate WCIX), but still a CBS affiliate owned by another network. Despite that, they kept their existing affiliation per their original contract until it expired on December 31, 1988.
Jon Fox, Hothaus Design
This logo began to appear in October 1988, a year after NBC purchased WTVJ from Kohlberg Kravis Roberts, with the underlying shape of this "4" is the same as its predecessor. It was originally designed by Jon Fox of Hothaus Design, who also redesigned its newscasts' set. During its first year of use, only the "4" itself was used during the station's final year as a CBS affiliate; after the switch in 1989, the peacock began to appear beside it.
On January 1, 1989, at 3 am, WTVJ, WCIX (channel 6, now WFOR-TV on channel 4), and WSVN (channel 7) made a three-way affiliation swap that saw NBC programming move to WTVJ following the network's purchase of the station in 1987, which sent the CBS affiliation to WCIX following its purchase of channel 6 in August 1988, with WSVN becoming a Fox affiliate.
The modified "4" from 1988 was replaced by the one influenced by its sister station WNBC in New York City in December 1992. The "4" was also shared with sister stations KNBC in Los Angeles, WRC-TV in Washington, D.C., and KCNC-TV in Denver; the latter became a CBS owned-and-operated station when WTVJ moved to channel 6 and continued using its logo as a CBS owned-and-operated station until 2003.
Between April and September 10, 1995, WTVJ used these secondary logos. The "Channel 4 News" logo continued to be used on the station's newscasts until that date.
“You're watching WTVJ, NBC in South Florida.”
— Danny Dark, station announcer
September 1995–2009 (primary), 2009-2012 (secondary)
On September 10, 1995, WTVJ swapped its over-the-air channel position with CBS O&O station WCIX, with WCIX moving to channel 4 (and changing their call letters to WFOR-TV) and WTVJ moving to channel 6. These continued to be used as a secondary logo until 2012.
On July 18, 2012, WTVJ was rebranded as NBC 6 South Florida. The rebrand featured a new expansive set designed by Clickspring, along with the new "Look F" graphics package by NBC Arthouse, which varies depending on the time of day, and a new custom music package with the NBC signature. Below are demonstrations of the new on-air look. The 6 used from this point is similar in style to the one used by YSLA-TV in San Salvador six years earlier.
Later on June 13, 2016, with the debut of the 4pm newscast, NBC Arthouse (by then would later become currently as "NBC Creative Services") redesigned the on-screen graphics, known as "Look N". Coincidentally, WTVJ also dropped the South Florida name, rebranding it as simply NBC 6 once again.