Grievous Gladiator's Ironskin Helm is part of the transmog set Grievous Gladiator's Ironskin Armor (Monk only), which the Appearances collection lists in 2 versions. The other 13 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Grievous Gladiator's Ironskin Helm Fits
Other Items Named Grievous Gladiator's Ironskin Helm
4 other items in the current build are also called Grievous Gladiator's Ironskin 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 Ironskin Helm
Blizzard numbers items as they are created, so the named items next to ID 100346 (100341 to 100351) were usually added in the same batch as Grievous Gladiator's Ironskin Helm: the same quest line, zone, vendor or reward set.