Bob: Yes, that is the original seat. The tank was brown, the seat was brown, and in 75 even the gauge faces were brown. The SOHC4s had taken all the DOHC twin sales so Honda decided to make a "retro bike" to go the British twin route. Pretty, but it didn't sell because the longer stroke took the 450's spirit and it only cost $100 less than a 550-4.