@ Welsh.....I had one of the oldest ones with " XS eleven" written in cursive script on the side-cover badging...they later got facelifted and " 1.1 " was on the badging, and they had black motors.....I have NO idea, though, if there were any geometry tweaks....probably NOT.
We all found it strange, though, that when BP Yamamha SA built up THAT bike for Rod Gray, that they used the XS Eleven Special with it's mega laid back rake angle etc etc.....but they obv. knew something we didn't because it WORKED!