C
I'd say the hint is on the turntables, given the year. The fact that he's playing music off LP limits the stations to a few.
The 77-DX was an old microphone, even in '68.
I would guess that was a fairly small, maybe signal challenged station.
Are those transmitter meters on his right?
That could rule out a lot of stations.
The station signed on in 1962, with 81,000 watts under the WAEZ calls. It was the first station in Miami to broadcast continuously in stereo. It played easy listening music "from the beautiful Deauville Hotel in Miami Beach." The station was owned by Arthur E. Zucker, hence the "AEZ" in the station's calls. A few years later, it changed its calls to WOCN-FM to reflect its sister station WOCN-AM, which it was now partially simulcasting. It continued to play its format, and even began an attempt at Spanish language romance music. For a brief moment during the mid 70's, they were known as " Stereo 94".