Grievous Gladiator's Chain Helm is part of the transmog set Grievous Gladiator's Chain Armor (Hunter only), which the Appearances collection lists in 2 versions. The other 6 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Grievous Gladiator's Chain Helm Fits
Other Items Named Grievous Gladiator's Chain Helm
4 other items in the current build are also called Grievous Gladiator's Chain 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 Chain Helm
Blizzard numbers items as they are created, so the named items next to ID 100323 (100318 to 100328) were usually added in the same batch as Grievous Gladiator's Chain Helm: the same quest line, zone, vendor or reward set.