Redu, if you're referring to a handgun it is probably the Langenhan Army Model pistol (a.k.a. F.L. Selbstlader Model I). It was produced by Friedrich Langenhan in Zelia Mehlis, Germany. This was a blowback-operated semiautomatic pistol chambered in .32 ACP. It has a 4" barrel and a detachable 8-shot magazine. The pistol was made with a separate breechblock that is held into the slide by a screw. This feature doomed the pistol to eventual failure as when this screw became worn, it could loosen when firing and allow the breechblock to pivot upwards. The slide would then be propelled rearward and into the face of the shooter. This pistol was produced and used in WWI only, from 1915-1918, and was never offered commercially. It is marked "F.L. Selbstlade DRGM". The finish is blued, the grips are molded rubber, with "F.L." at the top. Today in excellent condition this gun could be worth about $300. Hope this helps!
Steve Mace