I do not believe the paint is original, though it appears it was done a long time ago, and I cannot prove it is not original. I have not seen an original ainted Airstream from that time period, especially not gold over black.
Paint overspray on the tires is interesting. I see several other signs that the trailer has been modified over the years. The awning was added. The fridge roof vent is missing. And it appears that the tail lights might not be original. It is hard to tell much more from a single photo.
Wally Byam Caravan Club International Historian
Vintage Airstream Club Historian
WBCCI/VAC #702 & #6768