This may just close the case on this thread. As it pictures the Sheerline on its original release, It would appear that the Model 6 designation would logically apply to the model pictured, with the externally mounted fuel tank.
June, 1961 ![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2016/01/full-9804-26516-june_1961_1_1.jpg)
It looks to me like the back room boys got their Green Book images mixed up in later years.
