http://ts2.mm.bing.net/th?id=HN.6080...7&rs=1&pid=1.7
Sorry was actually thing of a different style helmet actually worn by Michigan in 1915. Similar except for the front.
The 8 spoke was used but sparingly and well before 1920. Here is an example of a 1910 version of the helmet. If this was indeed genuine (which I think not) it would command a nice price with vintage collectors. This particular style had a VERY short useful life span.