This logo would eventually be dropped due to complaints from ABC that the "Circle 7" logo was too similar to those used for its owned-and-operated stations; all of which were on VHF channel 7 at the time.
The logo design looks similar to KHON-TV's "2" logo from 1977 to 1994. This was the last logo used by WNAC-TV; the FCC revoked the station's license due to misconduct by the station's owner, RKO General, and went off the air at 1:00 AM on May 22, 1982.
Channel 7 was relaunched under a new license and ownership as WNEV-TV at 5:55 AM on May 22, 1982. The call letters originally stood for New England Vision, and was owned-and-operated by New England Television (ran by grocery magnate David Mugar). Here, this logo is also known as "SE7EN".
Mugar sold WHDH to Ed Ansin's Sunbeam Television (whom Ansin was a Worcester native) on April 22, 1993. As a result, it adopted a circled 7 again, this time borrowed from now-sister station WSVN in Miami–Fort Lauderdale.
On January 2, 1995, WHDH became an NBC affiliate, after CBS programming moved to WBZ-TV following Westinghouse Broadcasting's affiliation deal with the network. On January 1, 2017, WHDH went independent with the NBC programming moved to WBTS-LD.