[@Aristo][@Darkmatter]
So for the western currency, I'm thinking Dragon Head Coins, which are minted maybe in Vrent mostly as it has the mines. It might run down to looking something like this.  

[list]
[*] Farthing 1 copper coins worth
[*] Halfshield 5 copper coins worth
[*] Shield 1 silver coins worth
[*] Groat 25 copper coins worth
[*] Tower 5 silver coins worth
[*] Blood 1 gold coins worth
[*] Lily 2 gold coins worth
[*] Eye 100 gold coins worth
[/list]

Just the rough idea so far, feel free to add or change or give feedback.