From Discworld MUD Wiki
An anseriform brooch.
Cunningly wrought in the shape of an extremely stylised duck, this brooch is a fine example of traditional Hublandish zoomorphic metalwork. Its form shows the influence of the far-faring sea raiders who sail the whale-road to the shores of the Rim Ocean, returning laden with the gold and treasure of (in this case) an Ordporian monastery. The deft-handed smiths of the Hubland folk have adapted the holy Flying Duck into a beautiful brooch, neck arched to gather a fold of cloth, broad tail and stubby wings decorated with rich blue-green enamel. It is in <condition> condition.
It is made of gold and appears to be a piece of jewellery. It is in <condition> condition.
You heft the anseriform brooch and guess that it weighs less than a pound.
When weighing it at a jeweller's balance:
The anseriform brooch weighs 50 g.