Not showing in the parts book for U.S. imports, k7... but the f models show a”comstar” wheel I think it was called......
But as far back as the 69’s guys were putting different wheels and tires such as 16 inch wheels and big tires on the back of 750’s..Heck, look at what guy’s on here are doing to those stock Honda bikes. Amazing to me actually... so your bike could and probably is a modified,but I’m sure, a bolt on wheel, but not factory from Japan....
I can’t answer for the service manager, but stories do get embellished with the years..
And I can get a new DID stamped wheel for my 75 550 today if I want it, I don’t know if it’s made by them....