Dublon is alternative currency for buying IM items. Dublons can be obtained from the monsters and chests of FC, DS and DW. See details in data base.
From main bosses of FC, DS and DW you can get Pouch of dublon. By opening pouch, character will receive 10 dublons.
Dublons can be also obtained with 5% drop rate by using New Sheepskin Scrolls
Dublons can be exchange for items from NPC Bief - Cocoa in Argent City (2212,2769).