the cb 77 dont have front attac tubes at all..it are like cbx 1000. bolted direkt to the head top breather .the engine are front tube..as stressed part of frame..the frame looks as a 754 said as a 750.. the front brake looks M ,bigger then the cb 77 one... as is also a doubbel "shue" type,,but smaller then this..
think i sell my cb 77..but it only are euro sale possibel..you have so many fine overthere..