Picked this up recently. Have wanted a orange 550 or 750 SS for several years as wife doesn't really want to tour anymore, and I didn't have a 'go for a spin' ride. I was skeptical at first that PO was telling stories, but it started and ran, so I paid what he asked and hoped. Well, the more I clean and polish, the more legit it gets. The only thing I know for sure isn't 100% original is the tank.
I suspect the bike might have been dropped, as left side case has small ding in bottom, and cuz the speedo/tach may have been replaced. The tack definitely damaged (building another), and I read the green dials were introduced in '76. The numbers on this indicate it's the last couple of the '75F0's, so maybe they are original.....
I'm getting tons of help in this forum, but not having used one before, still finding my way around. My plan is becoming two bikes in one; get to as close to perfect stock as I can, then add some easy to change street mod's for fun and style. I'll start a Project topic when I have a few of my plans completed, starting with '77 decals on this tank, and some 550 super sport decals I found to add as well. Should look pretty cool if I don't botch the job!