Helmets made by the Sächsische Emaillier und Stanzwerke firm were marked with the letters "SE" meaning "Sächsische Emaillier." These initials were placed on the inside left rim along side a two digit number denoting the metric shell size of the helmet. In 1943 the firm changed initials which resulted in the new shell marking "hkp." The "hkp" initials were later moved to the rear of the helmet and continued to be used through May 1945.
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