Grievous Gladiator's Dragonhide Helm is part of the transmog set Grievous Gladiator's Dragonhide Armor (Druid only), which the Appearances collection lists in 2 versions. The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Grievous Gladiator's Dragonhide Helm Fits
Other Items Named Grievous Gladiator's Dragonhide Helm
4 other items in the current build are also called Grievous Gladiator's Dragonhide Helm. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Grievous Gladiator's Dragonhide Helm
Blizzard numbers items as they are created, so the named items next to ID 100256 (100251 to 100261) were usually added in the same batch as Grievous Gladiator's Dragonhide Helm: the same quest line, zone, vendor or reward set.