Very rare NOS (Never Used) Sansui Rear Channel Power Block Board F-1357 for Quad Amplifier QR-500, ONE PIECE!
The board is in great condition, never installed, but it is untested, and it has some scratches on it. What you see you will get it.
It would be good to change all electrolytic capacitors, because they are very old and probably dried.
Those green and black small boxes are hybrid ICs custom made by Sansui, so they are impossible to find than on NOS board like this one. If you already have Sansui Amplifier QS-500, this very important board is the last chance to get one as spare board.
That board is not plug-and-play, installation must be done by a qualified technician only!!!!