From the source:

Charles Noe Daly was an antiquarian who discovered this bizarre piece at Bordeaux in 1917. It was a steel cuirass mounted with 19 pistols. Here is a further description from Firearms Curiosa,

“…cuirass of steel … when brought into a right angle position may be fired in batteries of four and five by pressing the studs and levers, which release the hammers which are cocked by a hook carried on a chain.“ The armor also came with a pair of stirrups that contained two pistols, which would fire by pulling on a strap in case one is pursued or attacked from behind.”