Second Hand Yamaha U3 with quiet time system (Headphones)

In fabulous condition this 1982 U3 is a stunning professional instrument.

It has a silent piano system fitted : 

The advanced technology in your piano allows you to play your piano normally or, if required, to
play it silently.

While playing your piano silently, only you can hear your performance through
headphones !!

 Still play your acoustic piano as usual;
 Convert your acoustic piano into a digital piano by simply moving
a single lever;
 Play and practice the piano without disturbing others;
 Enjoy a wide selection of excellent instrument tones;
 Use your acoustic piano as a MIDI controller*; and