As far as I can tell this was a pretty standard tape deck. These things have a bunch of DC motors but not much else. The potentiometer was pretty small but I harvested it anyway. Finally there were a few motor driver chips, some op-amps, push-button switches and transistors I pulled off.
Here it is:
The actual tape playing mechanism was pretty neat:
As usual, more photos are on flickr and they have a higher resolution.