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

I had a penny in my pocket change worth almost $3,000 - a coin expert said the date is 'nearly impossible' to find

The rare and valuable UK stamps and coins that could be worth a fortune

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

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

What modern (being used as currency today) coin (not limited to any one country) contains the highest composition of copper? - Quora

Most rare and valuable 1p coins in circulation from new currency to minting errors

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

Rare penny valued at £200k sold to the public - '500x more precious than gold!

Isle Of Man Penny KM 5 Prices & Values