This papercraft is Helm of Yngol, a unique heavy helmet found in the game The Elder Scrolls V: Skyrim, the paper model is created by Kuraudo3. Helm of Yngol once belonged to Ysgramor's son, Yngol, who was killed at sea along with his crew by Sea-Ghosts, as described in Yngol and the Sea Ghosts. There is another version on the site: Helm of Yngol Mask Papercraft Ver.1.
It can be upgraded with a Steel Ingot at a workbench, and also benefits from the Advanced Armors perk, which doubles the improvement. [Source: wikia]
You can download this papercraft model here: The Elder Scrolls V: Skyrim - Helm of Yngol Ver.2 Free Papercraft Download