Yeah the CT110 is the old one, still plenty getting around. They didn't have they hi/lo range. There was one with the dual range gearbox but that was sold as an ag bike. Not road register able in Aus.
The CT90 was the earlier one, same bike with the smaller engine.
The new design is lime green one but aust post paints them red (for obvious reasons).
Remember Honda doesn't make these for Aust post, they are sold all over the world (you know when you see these Asian countries with bikes running around everywhere, well many of them will be Hondas). I believe the CT110 was the biggest selling bike in the world for many years, hence never needing to upgrade it! (Think Toyota attitude). But sales started to slip a it with all the new competition, so a new design was in order....... This one will run for another 20 years no doubt!
Tough little bike the CT110 I have one that i used to use for shooting. I took it everywhere my mate went with his 4wd quad and never broke a thing. My mate would always laugh and tell me every trip that I would being it home in pieces..... But never happened.