Thats the 400cc show-only bike from Tokyo in 2004 called CBFOUR, sort of commemorating 35th anniversary of the CB750. A few years ago in Japan, many 350F owners were modifying their rides to look like the CB750K0; substituting w/ K0 tanks (w/ the tank bottom modified), sidecovers, badges, double cut front fender, early rear tail light, ducktail seat, paint jobs etc. Liscensing system over there restricts riders to cc size of bike and small bikes are very popular.