1) German style helmet. Leather liner is torn and inside shell marked "cKL64/55 9". 2) German style helmet. Liner is marked "58" and inside shell is marked "ckl66/3288". 3) German style helmet. Inside shell is marked "T603" and "Q62". 4) German style helmet. Inside shell is marked "DN105" and "Q64". 5) German style helmet with chinstrap. No markings on shell.