In Wrath of the Lich King it is item level 226 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 (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Heroes' Dreadnaught Handguards Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Heroes' Dreadnaught Handguards suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Heroes' Dreadnaught Handguards is part of the transmog set Heroes' Dreadnaught Battlegear (Warrior only). The other 16 pieces:
Items Numbered Next to Heroes' Dreadnaught Handguards
Blizzard numbers items as they are created, so the named items next to ID 39622 (39617 to 39627) were usually added in the same batch as Heroes' Dreadnaught Handguards: the same quest line, zone, vendor or reward set.