The answers are yes and yes.
The original owner would have a document from the factory with this information. But this was forty-five years ago.
Who did you buy your machine from? Can they tell you anything about its provenance?
Production records were of course kept at the Regensdorf factory. Those records were still accessible as recently as eight years ago. I'm unsure about the location of those records today, as the building that housed them was sold. There's a good chance that they no longer survive.
Because the A80 has collector appeal, people are scouring the globe for them, for the purpose of resale to collectors. Buyers can end up receiving something cobbled together from a collection of parts donor machines. This is becoming more common.