Errors increase the value of collectibles because a limited number go into circulation before it is spotted and corrected.

As with just about any asset, a coin’s value is determined by its market demand. This means that coins in short supply often see higher demand — and higher values. With coins, supplies are limited ...

Brits have been urged to remain vigilant for an elusive 20p coin that could be worth upwards of £50. The particular coin ...

A coin expert has called on people to keep their eyes peeled for a rare 20p piece that could fetch more than £50. The coin in ...