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All Italian M33 helmets listed by me were used in the Spanish Civil War 1936-1939. Some were reissued by the Spanish government after the civil war. Many were salvaged and stored by the Spanish. None were made after 1939. The following is a summation of characteristics of the Italian M33 helmet made during the 1930's and up to 1945:
Liner fingers have leather disc reinforcements where dome string is threaded through. (Post war: metal grommets on end hole of liner fingers)
Liner air vent rivets are two tab split rivets or starburst type. (Post war: star burst only, beginning in 1938)
Rectangular chin strap bales. (Post war: trapezoidal chinstrap bales)
Tan brown or white liner leather. Earliest liners are white leather. (Post war: tan/yellow leather)
Orange felt padding under leather liner. (Post war: yellow felt padding)
Liners have various stitching patterns in rear of liner. (Post war: liner has a very pronounced "Z" stitch). Note: sometimes the "Z" stitch is found on liners from the 1930's-World War 2, but is not very prominent)
Leather chinstraps are gray-green or various leather field replacement chinstraps. (Post war: chinstrap is tan canvas).
Hopefully this will clear up any questions in identifying the distinctive characteristics of these helmets. Any questions are welcome!