Pitspitr,
On current production Ubertis, the sights are the same on the octagon barrel rifles (semi-buckhorn on the rear, dovetailed blade on the front).
On the carbines, the '73 has a folding ladder sight. In the down position (for normal shooting) the sight is flat with a small V-notch. The '66 carbine has a folding rear sight that has no flat top, just a big V. If you fold it, you get a similar V but taller. The front sights on carbines are similar, blades on top of barrel bands, but the '66 blade is round when looked at from the side, and the blade on the '73 is rounded on the front but flat in the back.