10 Pence - Elizabeth II 4th portrait, non-magnetic

Guernsey's currency relationship with the United Kingdom is purely conventional — the island is a Crown dependency, not part of the UK, and its coins are legal tender only locally. The non-magnetic copper-nickel composition here distinguishes this run from the magnetic steel issues that followed as rising metal costs forced composition changes across British Isles dependencies in the late 2000s. Collectors differentiating these types rely entirely on a magnet, as the two are otherwise visually identical.