I have this model also complete and indeed it was a very full featured quality player and Stereo recorder for its time.  Of note are the RCA outputs to connect directly to home stereo equipment for playback.  This allowed those that did not have tape deck in home system to use this player as a tape deck in the homes receiver or preamp /amp stereo system.  Even the early inexpensive home combo stereos such as Electophonic  that were radio/record player had Aux RCA inputs allowing this model to be hooked up.  It is sad that Panasonic probably due to wanting a moderate priced player used a all plastic exterior and freq. range that was less capable than possible at that time thus limiting this Walkman as a higher end player.  Still although i dont know its orig. price must have been a very great value for all that was given as you can see in the extensive accessories included as you show.  

Oh, you've done very well there

You definitely have a steal of a bargain price for that and boxed !!  Does it work and record.  Mine works but must need some caps done as recording is spotty and weak.