The Heroquest book gives the following names for the silver coin in usage in Dragon Pass - silver, crown, lunar, guilder, penny, sovereign, and so on. All these coins appear to have a pretty standard weight - probably from trade practice. Here are my assumptions as to who uses what coins:
SILVER COINS Penny, Silver - general terms used for silver coin, regardless of issue. The silver penny weight dates back to the Imperial Age and was the weight used by the Jrusteli traders. A silver penny weighs approximately 5 grams and is about three times the size (and value) of a medieval denarius (penny) - making it pretty close to the value of a medieval groat (tuppence). About 100 of these pennies make a pound of silver.
Lunar Imperial - obviously this is the silver coin minted by the Empire. Most likely it is minted to pay Lunar soldiers and might be more common in the Provinces than in the Heartlands. Stamped with images of the Emperor and the Goddess (on the reverse).
Sovereign - this was the coin minted by the princes of Sartar. It is stamped with an image of the ruling prince.
Guilder - coin minted in Holy Country and accepted as legal weight by the guilds of the Holy Country. Guilds are not a western concept but are an Orlanthi adaptation to urban life and probably originated in Esrolia or Heortland. Guilds substitute for the extended kinship bonds in a clan, providing status, mutual aid and protection. A guilder is stamped with a symbol of the guild responsible for the minting.
Crown - coin minted by the kings and governors of Heortland. Stamped with symbols of the regalia of the Hendreiki kings, or with the symbol of Belintar the God-King.
COPPER COINS The most common encountered coin is actually the copper clack - a stamped piece of copper weighing about 5 grams. Although copper coins are stamped similarly to their silver cousins (although usually with less care), the coins are referred to in all Theyalan languages as "clacks". It takes 10 clacks to equal 1 silver penny.
Most folk in Dragon Pass probably don't use currency and rely on bartering or on measured weights of silver. The flood of Imperial lunars that has followed in the wake of the Lunar occupation means that the lunar is by far the most commonly encountered coin.
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