I think you are in for a let down of sorts. I can't think of the last time I saw a system here or anywhere in audio world with a prominent cassette player.
That said I do remember a somewhat competitive auction for an immaculate Nak Dragon. If there is sales data for your piece it almost certainly won't be for a single channel unit (in need of repair.) Nonetheless it may be worth your while to subscribe to the blue book, but keep in mind that there may not be any record of sales for that exact model, there could be data though on other better cassette players.
What else did this guy have was my immediate thought?
That said I do remember a somewhat competitive auction for an immaculate Nak Dragon. If there is sales data for your piece it almost certainly won't be for a single channel unit (in need of repair.) Nonetheless it may be worth your while to subscribe to the blue book, but keep in mind that there may not be any record of sales for that exact model, there could be data though on other better cassette players.
What else did this guy have was my immediate thought?