Interesting helmet, never seen one shaped quite that way.
To adapt and misappropriate a line from the Doobie Bros, “they just kept on lookin’ to the east”. :’) In particular, look at the helmets from Corinth:
http://www.mlahanas.de/Greeks/war/Armor.htm
This one came up as an image search hit (which yielded a link to the above page), but doesn’t seem to be used in the ‘blog which hosts it:
http://bmonday.com/images/35/r_DSC00115.jpg
Holy kaka, this is GREAT (found it on the main page of that ‘blog):
http://dilbert.com/strips/comic/2009-02-25/