Counterfeit - 1 Pound Elizabeth II 4th Portrait, Menai Bridge

By 2012, the Royal Mint estimated that roughly one in thirty pound coins in circulation was counterfeit — a figure alarming enough to justify scrapping the entire one-pound series in favor of the twelve-sided bimetallic coin introduced in 2017. The Menai Bridge reverse, issued from 2005, was among the most frequently faked of the fourth-portrait series, with forgeries varying wildly in edge lettering quality and alloy color.

This example is the counterfeit, not the genuine article.