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I saw you posted your helmet on this site. I think it may be the outer "shell" of a helmet such as this one this is made up of different parts from different gear....maybe?
a basic M1 Helmet?
It's British. It looks to be either Mark 4 or Mark 5 pattern helmet judging by the chinstrap. IMA is a good resource for the different patterns as they seem to have sold all the variants at one time or another: https://www.ima-usa.com/pages/search-results/mk%20iii%20helmet
Thanks for the info !!!