All the Opel ones built for Europe had double rust protection and triple final paint coat, which afterwards was treated to two final coats of lacquer then rubbed back and polished by hand paying particular attention to any gaps between the wheel arches and the boot pan floor, then an experienced carpet fitter would tailor cut the boot carpet to fit and then hand rub some rare Seal oil into the corners of the carpet to stop the corners from curling up. Some say if you gently lift the corner of the rear carpet of rear seat backs you may see a signed signature of the fitter, something like a hand drawn picture of two boobies with the wording "Hans woz ere!".
On the models sent to the UK, you were lucky if you had a bit of dirty grey felt thrown in the back, which would move around of its own accord when luggage was placed in the back and deform its shape over time, lifting the felt would reveal an untouched bare metal pan which may, if you were lucky, have some paint over spray that may have landed there from being bounced off the rear wing when the sprayed the rear quarter panels. Some also say, they also neglected to paint the inside of the rear arches with an unknown effect that this would have after a few years of our British Weather, "Hans are you sure about this?, Ja will be fine its only for the English", but deep down they knew back then, all them years ago about Britain leaving the EU.