The Sony SL-2000 Betamax.
We had one of these in the early 1980s. It actually belonged to my old high school, but I got to use it now and then. It was quite the device at the time and cost several thousand dollars. I remember at least one band trip I tagged along with my folks on where I shot video of the marching band (I wasn't in high school yet). This was a very cool rig at the time (the camera that went with it was a tank) and got me all nostalgic...and imagine my surprise that someone had a copy of this ad for it!