There is a faded design above the D. Also there is an Upside down R below Thale.
While Researching I read that during the end of WW2 the German factories were speeding up productions of their helmets, (as well as other war items) and they stopped curling the helmets Rims and had not Stamped their helmets with numbers.. The item "AUTHENTIC WW2 GERMAN BLACK HELMET Stamped by D. Leather Liner" is in sale since Thursday, June 29, 2017. This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\Germany\Hats & Helmets".The seller is "giginova" and is located in Granby, Massachusetts. This item can be shipped to United States.