Vest Test: 1923

From Shorpy:

September 13, 1923. Washington, D.C. “W.H. Murphy of the Protective Garment Corp. of New York stood less than ten feet from [Frederick County, Md.] Deputy Sheriff Charles W. Smith in police headquarters Wednesday and let the deputy fire a .38 caliber revolver straight at his chest. When the bullet hit, Murphy never batted an eye.

(via PCL Linkdump)