See photos and condition description. Shell size is 64, inner liner band 57, and outer band also marked with those sizes, but I cannot make out the date on the outer band. Very rare M42 in that the maker code ET is stamped above the 4-digit batch number at the rear of the neck guard; this maker code was changed in mid-war to "ckl." This is the only M42 I have ever had or seen bearing ET marking at rear of neck guard. My photos include a view of the left inner skirt for those of you who... won't take my word that there is no maker or shell size marking there. The ET is followed by shell size marking 64, but it is difficult to read. This helmet has been in storage at least since 2001 if not longer; I no longer remember where or when I acquired it.