are you asking me?....or just asking. I wouldn't have any off hand knowledge of overseas bikes, much less 750's. I would have to do research, like what I just did.
CMS is a great go to but an official honda parts book, starting with a first edition, would be about as authentic a start as anything else to begin a 100% restoration.
I know honda made all kinds of part changes...superceeded, I believe it's called........USA distributed 750's had the frame data plate on the frame neck. From a thread on here, someone pointed out that this data plate on european models was on another frame part around the battery. It might have been a 550, can't remember, but point made.
"restored " bikes are not the best go to for authentic information......too much anecdotal, opinions and feelings out there that get labeled as authentic..
The parts fiche showed two possible decals on the chain guard for the K6.....one is the tire mark, which starting with the K2 was on the rear fender. Don't know what the other one is....
"341" center code is K2....