With the exception of a stillborn 1931 prototype, the Series 6 represents the final Mercer model and, with it, the end of one of the greatest names in early American motoring.

It was produced during the famous Trenton, NJ, manufacturer's final three years, during which time Mercer had been saved from Hare Motors, an ill-fated attempt at an East Coast GM competitor by former employees, among them John Kuser, a member of one of the wealthy Trenton families that had established Mercer in 1910.

As its name suggested, the Series 6 was both a successor to the previous Series 5—famously powered by Eric Delling's robust L-head four—and also Mercer's first 6-cylinder automobile, with an engine by Rochester and manual transmission by Brown & Lipe.

It was a fine, powerful sporting automobile, true to Mercer tradition, but by this time, there was little money to build it and few customers to buy it.

Series 6 production began in July 1923 and stopped in March 1924; it picked up again in early 1...