Yamaha C7 Grand Piano with authenticated autographs from Frank Sinatra and Tony Bennett April 20, 2019 by Toby Hamilton Make: YamahaModel: C7Serial Number: 1873360Color: satin ebonyYear: 1974Size: 7’4Price: $35,000.00New: $104,999.00 (for S7X … unsigned)Savings: $70,000!