2026 Britannia One Ounce Base Metal Error Coin
Super-rare and highly sought after base metal 1oz 2026 Britannia from [The Royal Mint](file:///buy-coins/the-royal-mint/), struck in error on a cupronickel blank. This surprising error, now confirmed by the Mint, appears to have occurred when blanks for base-metal [Five Pound](file:///buy-coins/5-five-pounds/) coins were mistakenly used instead of 999 silver rounds during the minting process. The error was not caught, and these coins were distributed to a Royal Mint supplier. - These [error coins](file:///collections/error-coins/) feature the same designs as standard 2026 1oz Silver Britannias - It is understood that there are just 209 of these rare error coins in existence - Cupronickel composition confirmed with in-house XRF technology - authenticity guaranteed