This week in 2011, the final Mercury automobile rolls off the line at Ford Motor Company’s St. Thomas Assembly Plant in Ontario, Canada. The last Mercury, a Grand Marquis, is the dying vestige of a marque championed by Edsel Ford to fill the cavernous price gap between the Ford and Lincoln. Introduced in 1938, Ford sold more than 21 million Mercury vehicles during its 71-year lifetime. Being the middle child, it rarely had a distinct image, although it did have a handful of memorable models.