They'll be current models in cuba. Are you sure foreign aren't allowed to drive, maybe they just didn't want you behind the wheel and made up an excuse
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I actually discovered I wasn't allowed to drive because one of the drivers offered me a go in one, which prompted me to research it. Foreigners are only allowed to drive the (massively expensive) official rental cars, which are all boring modern stuff like Kia Rios. If I'd driven one of the classics I wouldn't have been insured and if you happen to have an accident and hurt someone, you can end up in prison.