This is from a 1997 clip of Huey Lewis with Chris Hayes on guitar. At first I thought it was a Mark III, but the faceplate appears to be gray, and it looks like there is a lot of space between the top of the knobs/eq and the top edge of the amp. You can get a glimpse of the amp throughout the video, but the best I could see of it was ~4:23 behind Huey. If you slow it down to .25, you can get a better glimpse of it. Thanks.
https://youtu.be/sj81HW92_Cw?t=4m17s
https://youtu.be/sj81HW92_Cw?t=4m17s