Leather Grimoire

Arcanist's Grimoire, item level 5. Equip level 5, ACN SMN SCH.

From 31 Dressed to Call and 1 more quest.

From quests

31 Dressed to CallChoose one of 4
35 What's in the BoxReward

Other databases

Eorzea Database (the official one, on The Lodestone)
Console Games Wiki
Garland Tools (vendors, crafting, drops)