Mann-of-LaMancha's avatar
At first glance of your first reference image, I thought it was rigid leather with metal banding riveted on, which Ilikewise thought when I looked at your 3D model, but I was wrong.

The text that goes along with your first image is as follows:
This helmet was forged from watered steel and decorated in gold and arabesques and Koranic inscriptions. It is very similar right now to one in the Kunsthistoriches Museum, Vienna. Made in about 1560 for the grand vizier of the Ottoman sultan Suleyman the Magnificent (reigned 1520-66).

Watered steel is another name for Damascus steel which it is thought to be derived from Wootz steel.

The other references are from the same general location, but different eras of time.

I've seen some modern leather armors made with similar ridges like on these conical helms in your references and work, which is why I mistook it for leather (or part leather). Modern leather armor fabricators make their wares according to practices that were used in ancient times (or as close as we can approximate them. As with Damascus steel, the secrets of their fabrication were lost to the ages). However, usually, there is usually a marketed difference with leather and metal colors, which again, is why it confused me.

It is possible that since this was made for the grand vizier, that is why it is made from watered steel and gold, whereas the common troops would have a visually similar piece but made much less expensively (i.e. with leather and banded steel).