Originally signed on the air on July 29, 1956 as WCKT, channel 7 was a primary NBC affiliate owned by the Biscayne Television Corporation, a partnership between the Cox and Knight publishing families.
A new company called Sunbeam Television, a partnership between Miami Beach-based father-son duo real estate developer Sydney and Edmund Ansin, purchased the station for $3.4 million on December 19, 1962.
This "Circle 7" (a similar, but not identical design as the G. Dean Smith-designed "Circle 7" logo for ABC stations transmitting on VHF channel 7) has been used by the station since 1976, surviving both a callsign and a network affiliation change.
It was modified slightly to its current version in 1980 (seen below), detaching the tail of the "7" from the bottom of the circle.
On June 7, 1983, WCKT changed its callsign to the current WSVN, and added a new wordmark to go with this change.
Six years later, on January 1, 1989, at 3:00 am, WSVN, WTVJ (channel 4, now on channel 6), and WCIX (channel 6, now known as WFOR-TV on channel 4) initiated a three-way affiliation swap resulting from the latter two stations becoming network-owned outlets: NBC programming moved from WSVN to WTVJ following the network's 1987 purchase of that station from Kohlberg Kravis Roberts, while its former CBS affiliation was sent to WCIX through that network's August 1988 purchase of channel 6 from the TVX Broadcast Group. Fox programming moved from WCIX to WSVN, after Sunbeam unsuccessfully sued General Electric/NBC and CBS over the acquisitions.