In Wrath of the Lich King it is item level 213 and requires level 80. In MoP Classic it is item level 213, requires level 80 and sells to vendors for 1c.
Read from the World of Warcraft client build files.
How Deadly Gladiator's Wyrmhide Helm Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Deadly Gladiator's Wyrmhide Helm suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Similar Items
The 10 items nearest to Deadly Gladiator's Wyrmhide Helm (item level 35) in item level among Armor > Leather, Head slot, from item level 32 to 39.
Items Numbered Next to Deadly Gladiator's Wyrmhide Helm
Blizzard numbers items as they are created, so the named items next to ID 41326 (41320 to 41332) were usually added in the same batch as Deadly Gladiator's Wyrmhide Helm: the same quest line, zone, vendor or reward set.