This post-war Nash 600 (circa 1946) was found resting safely behind a fence next to a brick building in the Detroit area. The Nash 600 is credited with being the first mass-produced American automobile using unitized body/frame construction techniques in which the car body and the frame are welded as one unit, rather than the more traditional body-on-frame. Built from 1941-1949, the "600" name comes from the car's ability to go 600 miles on one tank of gas. An advertisement for the '46 proclaims, "The new Nash 600 takes you an amazing 25 to 30 miles on a gallon of gasoline at moderate highway speeds — 500 to 600 miles on a tankful." (Photo by Chris Sawyer)