The Germanicon Walther PP and the PPK had decocking levers well before the Walther designed P-38 came along. It is where Walther got the idea for the P-38 to have it. Now because of the age of it there are some P-38 pistols that the decocking system doesn't work properly and these can fire when the hammer is dropped. Always be sure to keep the pistol pointed in a safe direction when you lower the hammer.