Steinway M Grand Piano September 21, 2016 admin 5' - 6' Length, Brands, Grand Pianos, Steinway Steinway M Serial Number: 304257 Finish: Ebony Polish Size: 5’7″ Warranty: 5 Years Other pianos you might like...Yamaha C3 Grand Piano Yamaha C3 Grand Piano Serial Number: 6105160 Finish: Ebony Polish Size: 6'1" Yamaha U1 Upright Piano Steinway M Serial Number: 304257 Finish: Ebony Polish Size: 5'7" Warranty: 5 Years ❮ ❯