USGI -
Your helmet appears to be one of the foreign copies of the US M-1. The plastic liner is definitely is one of the copies. There were several NATO countries that used copies of the M-1.
The US liners were made from different types of canvas impregnated with resin and most were then pressed onto a mold under high pressure. There were a few that used low pressure, but the same general method of putting strips of material over a mold. There were several manufactures working at the same time using different methods - Westinghouse was the largest maker through WWII and they kept making them alongside other companies all the way through Vietnam. There were different specs throughout the years for liners. Usually small changes ordered from the government. The different changes help ID helmets for collectors.Information
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