Ancient Dwarf Coins
Ancient Dwarf Coins are the ancient currency once used by the inhabitants of the Lost Dwarf Fortress.
The coins are mostly made out of copper, brass, iron and other non-precious metals. They are effectively worthless (can be spent as copper coins if vendor is willing o accept them as currency) but have immense historical value to collectors or scholars.
The coins of different denominations feature dwarven heroes, and scenes from ancient legends. If arranged in a circular pattern they can be used to recount old legends and heroic exploits. There's either five or seven known stories that can be built using the full set of coins, based on their position in the circle, ordering and which way they face. There might be more stories that can be unlocked by finding new ways to arrange the coins. Scholars seek out these coins because they are the key to study lost dwarf folklore. A full set in a good condition is extremely hard to find.