https://bitcointalk.org/index.php?topic=415365.msg4506815
Proof of sale of 2011 1BTC Casascius coin *HOLO ERROR* - 1DazbUgV
proofsalecoinholoerror
https://coins.thefuntimesguide.com/1922-plain-penny-error/
Oct 15, 2024 - Why is there a hole for the 1922 plain penny (error coin) in Lincoln cent albums? Most collectors can't afford to fill that space. A collector's...
error coinplaincentincluded
https://www.hulldailymail.co.uk/news/uk-world-news/check-your-change-rare-brexit-10688771
Dec 5, 2025 - Coin experts are urging people to check their Brexit 50p coins for a rare date error
error coincheckchangerarebrexit