In Wrath of the Lich King it is item level 200 and requires level 80. In MoP Classic it is item level 200, requires level 80 and sells to vendors for 1c.
Read from the World of Warcraft client build files.
How Hateful Gladiator's Wyrmhide Helm Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Hateful 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 Hateful Gladiator's Wyrmhide Helm (item level 35) in item level among Armor > Leather, Head slot, from item level 32 to 37.
Items Numbered Next to Hateful Gladiator's Wyrmhide Helm
Blizzard numbers items as they are created, so the named items next to ID 41325 (41319 to 41331) were usually added in the same batch as Hateful Gladiator's Wyrmhide Helm: the same quest line, zone, vendor or reward set.