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Anyone know what a mint 1969 Sansui 2000 Tuner Amplifier is worth?

Could anyone tell me what my Dad's mint condition 1969 Sansui 2000 Fet Solid-State AM/FM Multiplex Stereophonic Tuner Amplifier is worth? He's got a perfect manual with it, and the original recipient from Japan 46 years ago. It says it's got 36 watts per channel RMS @ 4 ohms, music power is 100 watts @ 4 ohms. It looks just like the one in the library. Thanks, Brian