Not enough information. Please post a new question with a more complete description of the "piece". Is it a coin? A bullion issue? Something else? Does it have a denomination on it?
Note that US...
tough question because even if you just mean their metallic or monetary value rather than their numismatic value the various silver coins that are called pieces of silver had different weights as...
Like precious metals of any age, it depends on the weight and scarcity of it. In the Old Testament Book of Exodus, it was worth the price of a slave. In the reign of King Solomon, it had little worth...