This handle is installed on the inside end of the flat lever arm window operators in late 1970s Airstreams. Ours is made of zinc with chrome plating. It is a replacement for the obsolete plastic version which was ivory color. It was Airstream part number 380227 or 683976.
Chrome plated two-piece handle
We know the flat lever arm style was used on many (but not all) Airstream models from 1975 to 1979. Let us know if your trailer falls in a year outside that range.