From Wikipedia:
"Dieselpunk is based on the aesthetics of the interbellum period through World War II (c. 1920-1945). This sub-genre is sometimes named Decopunk, referring to the Art Deco art style (including its Streamline Moderne variant). The genre combines the artistic and genre influences of the period (including pulp magazines, serial films, film noir, art deco, and wartime pin-ups) with postmodern technology and sensibilities. First coined in 2001 as a marketing term by game designer Lewis Pollak to describe his role-playing game Children of the Sun,[12] dieselpunk has grown to describe a distinct style of visual art, music, motion pictures, fiction, and engineering. Examples include Crimson Skies, Sky Captain and the World of Tomorrow, Dark City"