OK - I just bought a 1977 CB750A Owner's Manual on ebay. I hope I wasn't bidding against anybody on this site. It certainly sold for more than I initially wanted to pay.
Just so you know - I plan on scanning it, and then reselling it. If I outbid you, let me know, and we can work out a deal . . . .
But . . . I do plan on posting the manual on this site, so we all can have access to an owner's manual. So, while this may cost me a future sale, posting it is for the greater good.