Inversion Principle is a completely original timepiece, designed by Adrian Glessing and developed by David Candaux/Du Val Des Bois exclusively for Fonderie 47.

The sale of each timepiece funds the destruction of one thousand assault weapons in Africa, creating a safer environment for aid and development.

First and foremost, Inversion Principle is a very exclusive haute horlogerie timepiece, with subtle elements and mechanisms that discreetly feature key attributes of the AK47. Each timepiece incorporates a plate on the back made from the transformed steel of a destroyed assault weapon.

The central 3-minute flying tourbillon dominates the three-dimensional dial. Three second-hands, equally spaced 120° apart around the tourbillon cage, arc across the seconds-scale above the tourbillon and 'Fonderie 47': The tourbillon revolves at just 1/3 of the speed of a traditional tourbillon. Only one second-hand is visible at any time − the other two are hidden under the gold rifle-sight inspired frame set into the sapphire crystal.

Gun mechanisms snap sharply and precisely into place: As does the instantaneous jumping hour at 12 o'clock as it changes the hour; and the large 240° retrograde minutes hand as it flies back to zero each hour across the bottom of the dial. Each press of the quick-set pusher in the crown advances the jumping hours by one hour.

The long 6-day power reserve has both a lateral indication via a sapphire window set into the left side of the case band and a second indication visible through the display back.

The display back reveals the stunning sunray guilloche pattern radiating out from the ratchet wheel, which is capped by a dark plate of transformed steel from a destroyed AK47. The plate is in the form of the Fonderie 47 brand symbol and rotates as the watch is wound. '56-3701F42', the serial number of the destroyed weapon the metal is from, is elegantly hand engraved beside the plate.