Hello, I'm an expert in historical artifacts and equipment. When discussing the weight of a "ball and chain," it's important to clarify the context, as this term has been used in various ways throughout history.

In a historical context, particularly in relation to medieval punishment or as a form of restraint for prisoners, a "ball and chain" typically refers to an iron ball that was attached to a prisoner's leg with a chain. The weight of these devices could vary significantly based on the period, the region, and the specific punishment or restraint being used.

For instance, in some historical accounts, the ball could weigh anywhere from 5 to 50 pounds (2.3 to 22.7 kg) or more. However, these weights are not standardized and could differ. It's also worth noting that the use of such devices has been largely discontinued in modern times due to humanitarian concerns.

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A ball and chain believed to date to the 17th century was found in the United Kingdom in 2009. It consists of a sphere of high-grade iron approximately 15 centimetres (5.9 in) across and weighing around 8 kilograms (18 lb). The chain is of some 90 centimetres (35 in) in length and terminates in a leg iron or shackle.read more >>