This is an Osborne 1, billed as the first portable computer, and in many ways it was. I remember seeing these advertised and I dreamed of having one, or something like it, but $1800 was way too much for me in those days. Even then the tiny screen was a bit off putting. It's nestled in between the two floppy drives. At 5 inches that screen is just a bit larger than the display on my phone today, but at 24 pounds it's a lot heavier.
http://en.wikipedia.org/wiki/Osborne_1