Attachment 322989Attachment 322990Attachment 322991Attachment 322992Attachment 322993Attachment 322994I just received a WW1 helmet but what baffles me is the heat stamp indicating "CU308" under the brim. I find no listing for this anywhere but I read in an older blog that "X, Y and of course "Z was used for american helmets. Is it possible the letter "U" was used before the other letters? If so, can that be a rare one issued? There is no liner or pad in the lid nor does it use the split rivets. I’m trying to upload photos but am having difficulty, but I can e-mail them.

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