Flea market find yesterday, empty box , later used to store bird egg collection ( long gone ) but box still has a list of the eggs stuck on one side.

Original m1917 shells came in one size, and original liners came in several different sizes.  The liner should fit your head more or less like a hat, rather than being perched on the very top of your head.  I'm pretty sure all the reproduction liners are "one size fits all", so if you're using one of those it might be a case of "one size fits most".  It's also possible that the shell you have is not a standard m1917.  Pics of the helmet and liner would probably help if you can post them.

Thanks Kurt,   It looks just like an OD border variation except white.     

I really appreciate all your feedback concerning that hole.   Now I must find out from where that part is from.

George built that building by himself he would always say.    I wonder what happened to his collection.

Looks like it may have been red with a white stripe at one time, under that gray. 

thank you Mr. Josh  

Howdy, This is from WW1. Look up Howard Chandler Christy.

I've always thought the white border on this patch was just a manufacturer variation. The white border does not "indicate" anything.