Brass body. Steel shackle. Deutsch was the forerunner of the Nix Pix and Salon locks. Some Nix Pix and Salon keys say “Deutsch Lock System” on them. The hole in the side of the padlock is for disassembly. When the key is turned to a specific position you can poke in the hole and pull the cylinder out from the bottom.Patent #2325310. US Patent #2557028.