Well, If we look at the various years, the 78/79 CB400 TI Hawk I had spoke wheels and a mechanical drum brake in the front. The 78/79 CB400 TII Hawk II had Constar wheels and hydraulic front disc brake. There were no CB450s between the 1974 CB450K7 and the 1982 CB450SC. The SC engines which were similar to the 400s in the Hawk had black cases.
Again, the confusing issue here was, some guy who wrote the display spec sheet, mistakenly put CB450 on it, instead of CB400. I did not see that. Need better glasses. Or watch more thoroughly.