The Anarchy of King Stephen
The currency system in medieval England was based, as in modern times, on the pound. Medieval currency wasn’t fiat currency; a coin was worth its weight in silver, and a pound was literally the value of a pound of silver.
Wessex uses this convention, and the currencies in common usage (and their SRD equivalencies) are as follows:
|Pound (not actually a coin)||20 shillings||pp|
It’s worth noting that this currency system is relatively “new,” from a world history perspective. It’s based on Charlemagne’s denarius-solarius-libra system, and such coins from the continent would be largely interchangeable with Wessex coinage (though the merchant would probably weigh them to be sure).
Gold coinage is extremely uncommon, and would be worth a significant amount, if any could be secured.