Hi, new around these parts. I've been looking at getting me a CB750 of some kind and I've been looking at this one right here

He claims it's a '79. I asked for a frame no. and he gave me CB750K2737411 - which is a '79, but a model K? Looks more like a Bol D'or to me, except it looks like it says "CB SevenFifty" down the side, which i can't really make out clearly. But for sure not 750F.

Can anyone help clear this one up for me?