Airstream trailers manufactured in the 1930s that are in excellent original or accurately restored condition are the most expensive collectible Airstreams. According to Airstream's website, The aluminum collection effort during World War II destroyed many Airstreams, making the earliest Airstream trailers hard to find.
The most collectible used Airstream trailers are those in optimal condition for their age, according to Vintage Airstream. Physical condition, how much of the trailer is original and the quality of any restoration work are the basis for the value of a used Airstream trailer. VintageAirstream.com suggests that owners can raise the desirability of a used Airstream with quality repairs and restorations.