From the ArcaMax Publishing, Trivia Newsletter:
http://www.arcamax.com/news/trivia/s-346613-784760
The Colt Single Action Army handgun (also known as the Colt Peacemaker, Single Action Army, Colt .45 and sometimes as The Equalizer) is a single action revolver with a revolving cylinder holding six rounds. It was designed for the U.S. government service revolver trials of 1873 by Colt's Manufacturing Company and adopted as the standard military service revolver.
This news arrived on: 05/12/2008