More radio checks (see thread from same date/time for frequency 6960 kHz / 6.960 MHz LSB mode) heard on 6880 kHz LSB. Sounded like the same operator too. Likely somebody checking their SWR and/or tuning their antenna. I have a feeling somebody was up on 11 meters...and then they dropped down to below the 7000 kHz / 7 MHz amateur band 40 meters. The 6700 to 7000 kHz range is a favorite for these stations, but they have been heard all over the place.
Nothing heard after 0010 UTC. Chances are he's moved to a different frequency.