Speaking of plastic cars here is some history: http://en.wikipedia.org/wiki/Duroplast
I think that picture must be from 1937, as it seems to depict the german and soviet pavilion from the expo (as seen here on wikipedia: http://en.wikipedia.org/wiki/File:La_Tour_Eiffel_en_1937_con...)
Speaking of plastic cars here is some history: http://en.wikipedia.org/wiki/Duroplast
I think that picture must be from 1937, as it seems to depict the german and soviet pavilion from the expo (as seen here on wikipedia: http://en.wikipedia.org/wiki/File:La_Tour_Eiffel_en_1937_con...)