Help with Helmet Identification

[CharlesS]

Hope I can get some help with the proper identification of the cultural origin of this unique helmet.

It has some features that seem Islamic....spiked(if subdued) top, nose guard, and Islamic style chain mail...but some unique features as well. It is a two piece dome with the bottom portion riveted to the top at the rib, which hides the rivets. This recreates a very deep dome.

The helmet was found complete, but in pretty rough shape with a outer layer of active rust with heavily patinated rust beneath. You can still see the impact of the old rust on the outer portion of the helmet by way of many small spots and one large area of light pitting. The helmet is clearly quite old.

At first glance it reminds me of some Sudanese helmets, but it seems perhaps too refined for that.

I am looking forward to any input regarding the origins of this piece.