I believe the original color of the car is the blue...
In my humble opinion orange is chloride-rubber based paint covering the bottom of the car and later on reinforced/coated with anti-rock protection.
If that is true previous owner was an expert and it the the reason why the car survived in such a great shape. I would expect also wax or grease in the inner sections (sills, doors, etc).
... it reminds me 70's and 80's ...
Behind iron curtain car was extremely expensive (used cars were more expensive than new as you would need to have ticket from the Communism Party to buy it). People having cars, basically very prone to corrosion were doing a lot to keep them in a good shapes. Special waxes were not available so people were creative mixing oils, greases with kerosene or other chemicals to make the protection by themselves. Later on, during sunny days such a car was marking it's way as this chemistry was dipping on the street.
It is also valid for new cars still as due to weight and cost (and environmental reasons) they are again less protected in comparison to cars from 90's or 2000 era.
It would be than also recommended if someone would like to keep it longer in a good shape as most of them are not protected from below as for example new Ford Fiesta I was making protection for my Friends (wax plus body protection). Of course paint and steel quality plus the whole passivation is making car bodies better protected than it was in the past.
