Spanish Civil War battlefield pickup: pre-WW2 Italian M33 helmet. Shell paint is dark green. No stack marks. Tiny dent on back rim which resulted in a vertical crack of under 1/2 inch. This is combat damage (spent bullet or shrapnel). 

Plain front (no Spanish insignia holes nor brackets-- original Italian surface). Type 1 double tabbed vent rivets (pre-1938). Back rim code is B84 one of the first M33's to be manufactured. Liner size is 57. Liner is very good, no damage, leather flexible. 

 Overall good solid condition. White leather liner manufactured 1938 and prior. Dome string is moderately stiff  and is original Italian manufacture. Italian chinstraps in fair to good condition. Chinstraps have slight to heavier alligatoring but are flexible. Buckle strap has field repair Buckle strap is sewn together from being broken.

Helmet components are all Italian manufacture.

 Helmet was used in the Spanish Civil War 1936-1939 by fascist Italian and Spanish troops under Franco.  

A scarce souvenir of the Spanish Civil War. 

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Note: All 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:

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)

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, usually not very prominent)

Leather gray-green or various leather field replacement chinstraps. (Post war: chinstrap is tan canvas with large sliding buckle). 

Hopefully this will clear up any questions in identifying the distinctive characteristics of these helmets.