If you are looking at this ad, I probably don't have to tell you how rare this sidecover is. This model was made in one half of each model year 1968-1969. The right sidecover was interchangeable with either the CB or CL450 of these years. They didn't sell many, and I have only seen one in my lifetime of collecting bikes.
This model has the indentation for the almost rectangular 450 badge(wish I had one!). The other thing about it is that it is chromed beautifully. In stock form this part was not chrome. I have a couple of theories. Honda had some all chrome bikes that they let brand new dealers sell as a part of their grand openings back then. This could have been one of those. If not, it was just chromed. It was a lot less expensive back then, and lots of people had things chromed
It is in gorgeous shape, just a couple of small nicks here and there.
I also have a red painted right side K1 available under a separate sale.