Out of curiosity, how do you tell the difference between the WWI and WWII version?
Larry Wolkow

The World War I era ones are bigger and bulkier looking.

Here is a [World War I](http://www.ima-usa.com/original-imperial-german-wwi-m16-stahlhelm-helmet-shell-size-62.html) era one.

This one is [World War II](http://www.ima-usa.com/original-german-m40-wwii-type-steel-helmet-finnish-m40-55-contract-4565.html) era one.

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