A bellows visor close-helm, 16th century or so. This one was based off of a helm in the Glenbow Museum in Calgary. This helm was made of a relatively low-carbon steel, and I tried giving it a heat-treatment and quench in water from 1500 degrees fahrenheit. This made the helm slightly more resistant to dents, but I need a higher-carbon steel to get really high performance out of the heat treatment.

The shape of the helm glances incoming blows beautifully; great for polearm duels and against those who make heavy use of thrusting in their combat. The eyeslots may look small, but I find the vision to be outstanding compared to having big ugly bars in front of my eyes. And then there is the whole eye-contact intimidation thingy. Although it does get very hot very fast in there.

My version: 

And the original, currently residing in the Glenbow Museum, in Calgary, Alberta. The eye-holes are different, but the general design is the same: