Pretty much the same as it was.
Anything like a unified currency was a bit of a dream, so when "universal" prices are given (in City & Guild, which you should pick up if you're planning to do anything serious and long-term with money) they're given in mythic pounds. Of course, City & Guild also ends with: "you should not feel that you are doing anything wrong by inventing the prices of specific goods".
Still, when you do invent those prices, how do you denominate them? The mythic pound reflects a fairly common structure of money across Europe, based off of Charlemagne's silver standard, where "a pound" was an actual pound of silver, divided into 20 shillings of 12 pence each. Shillings and pounds go on the account books; significant trade is usually done in equal values of trade goods, which can themselves be cartloads of common staples or smaller quantities of dyes, spices, silks, or gemstones. To the extent a given grog will have coins to throw around, they'll be silver pence or pennies, accounted as "denarii" after the Roman coins but usually with some other local name, and there'll probably be a local attempt at a slightly larger silver coin of some description, because it's the actual weight of the silver that matters.
If you're near or regularly trade with the Byzantine empire or points further east, their gold coinage, bezants or denars, will also be in slightly rarefied circulation at half a pound - 10 shillings - apiece.