NC01 refers to the CM400 models. In the US they started in 1979 and ended in 1981. Other countries, European mainly, still received the CM400 until 1983 or 84. There are minor cosmetic changes thru the years but mechanically they are all pretty much the same.
Where are you located?
1979 CM400T "road bike" modified for travelling
1978 CB400T1 restored
1972 CL350 survivor restoration
https://www.hondatwins.net/forums/22...d-attempt.html and https://www.hondatwins.net/forums/1-...r-attempt.html
Road Trip https://www.hondatwins.net/forums/11...here-i-go.html or "where's Jim now?"
Member Map https://www.hondatwins.net/forums/dcMembermap.php