This is a Portastudio 424mkiii, tested and mostly working. It's a little bit dusty. There are three issues: the cassette cover is missing, and there's a weird problem where the capstan/motor thing that spins the cassette tape is always spinning, as soon as you power the unit on. 

The major problem is that the motor that plays the cassette is not getting consistent voltage (probably because it's failing). The result of this is that when you play back what you've recorded, everything sounds highly flanged or chorused. Might be cool as an effect, but if you're trying to use this for a main recorder you should get it repaired. This includes a power adapter as well.

Any other questions, just ask!