CB-550 K1 / CB-750 K5
This is the original 1975 brochure for the American market. It shows a CB550 Four K1 in Candy Jade Green together with a CB750 Four K5 in Planet Blue Metallic. Other colors available for the CB550 Four this year was Candy Flake Orange.
In these pictures you can see the new graphics on the side of the fuel tank similar to the design of the CB750.