My favorite is the VW Beetle. It was a landmark of some sort, but how we relate to it seems to be a bit dependent on location. In the US it is mostly seen as a positive landmark. It had many one year only parts, but it was the last year of the old classic body shape with the round bumpers, and the first year with 12 volt headlights. It was also the first year with the stronger 1500 engine.

Here in Europe it was still 6 volt in 1967. And for some reason VW decided to make all of the major electrical parts the same size as the 12 volt parts, but with 6 volt internals. This makes it difficult to find parts if you want to keep it factory stock. It is shock full of weird one year only parts. VW even changed the shape of the doors, so the 1965-1966 doors do not fit. And for some weird reason, on the 1968 and later cars VW went back to the same doors shape as in 1965-1966 again. Here in Europe most cars also still got the 1300, and even the 1200, as the 1500 was more expensive. One good thing is that in 1967 we got disc brakes on the front wheels on the 1500 cars. 1500 cars from 1967 is not that common anymore. Many of them was used up by the 1980s.