NRA National Firearms Museum has this Nazi Belt Buckle gun in their collection. It is called the Marquis Nazi Belt Buckle Pistol. Looks to be chambered in 7.65mm. I cannot seem to figure out how this pistol is fired. I suspect it is loaded when the barrels are folded there by exposing the chamber. Then once it is deployed, I see two springs that line up with each barrel. Possibly they are released and somehow the lateral movement is transferred and strikes the primers.