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Understandable. It is like time traveling.
What I understood talking to people;
In the 1940 until about 1960 they were imported from the USA, back then they were not so expensive of course. Different times, different money.
Suddenly because of many reasons they stopped importing to CUBA around 1960.
The people needed to be inventive as they also didn’t get new parts when something broke. If they wanted to have a car it needed to keep running.
Sometimes it is fun to see how it is all holding up from the inside but not visible from the outside. Or a tractor motor under the hood for example.

Nowadays, cars get in again. But all the old ones from that time remained. Not all are well preserved, but a lot are. And you can admire them at any time while visiting.
Now with tourism picking up (not looking at pandemic times) loads of those cars are used as taxi and with earnings they are fixed up to the standards of now.

Thank you very much for the clarification, these questions arose before, but were forgotten, you reminded me).

You are welcome @barski happy to help a little bit.