This item is acquired in-game. See its sources below.
In the Appearances collection, Tidewrought Coif is listed as Quest. Appearance ID: 120774. 8 other items wear the same appearance:
Read from the World of Warcraft client build files.
Mail is the armor type Evoker, Hunter and Shaman wear. With Agility or Intellect, Tidewrought Coif suits Beast Mastery, Marksmanship and Survival Hunter; Elemental, Enhancement and Restoration Shaman; Devastation, Preservation and Augmentation Evoker.
Tidewrought Coif is part of the transmog set Thalassian Mail Armor (Hunter, Shaman and Evoker only). The other 16 pieces:
Thalassian Competitor's Chain Cowl
Burnt Watha'nan Chainmail
Lynxslayer's Scale GripsEversong Defender's Helmet
Twilight Spy's Breeches
Waistguard of Herbicide
Reluctant Diplomat's Vambraces
Lightstalker's Boots
Bloomtrimmer's WrapTwilightbreaker's GripsZulguard's StridersSkyblessed ChainmailSpiritwarden's CinchProwlers Shawl
Atalguard's Oath ShoulderguardsBuilt from the World of Warcraft client build files and recorded Auction House snapshots.
First-party render from the game files. Model © Blizzard Entertainment.
Tidewrought Coif is not traded on the Auction House, so it has no live market price. It is acquired in-game from the sources listed above. This page collects its first-party game data (identity, effects and where it comes from) from the official World of Warcraft client build.
TheWoWDB