Penny sells for £72,000 and is now the most expensive copper coin in the world, The Independent

Coin which is one of four in existence sold at auction after fierce battle between two bidders

What Are The Most Valuable Pennies? 5 Most Expensive Pennies - MoneyMade

RCMR - 2022 #1 January/February by Professional Coin Grading Service (PCGS) Market Report - Issuu

Extremely rare coin made for King Edward VIII's short reign sells for record £133K – The Sun

Great Britain Penny KM 794.1 Prices & Values

How Much Are Old Pennies Worth?

British Honduran 1 cent coin, Currency Wiki

Rare penny Army veteran found in his lunch money in 1947 sells for more than $200K at auction

The 13 Most Valuable Pennies Ever Sold at Auction - Damia Global Services Private Limited

RCMR - 2020 #3 May/June by Professional Coin Grading Service (PCGS) Market Report - Issuu