In 1921 Rolls-Royce opened a new factory in Springfield, Massachusetts in the United States (to help meet demand) where a further 1,701 "Springfield Ghosts" were built.
En 1921, a compañía abriu unha segunda fábrica en Springfield, Massachusetts nos Estados Unidos (para axudar a satisfacer a demanda), onde se construíron outros 1.701 "Ghosts Springfield".