There are approximately 10,000 Polski Fiat 126P currently in Cuba (2019).
Since you cannot import a car (but you can send parts), these are very valuable.
I have been carrying out extensive repairs on my 44 year old one.
It is "series 1".
Sending spares is extremely expensive, but the Tangara parts shop in Havana rarely has much in the way of spares, and any which come in are immediately bought up for resale.