Glass penny made during Second World War up for auction
An experimental penny made of glass during the Second World War is to be auctioned.
Owner Roger Burdette said the coin is the only known unbroken glass penny in existence.
During the war, copper was needed for ammunition and the US Mint authorised tests that included making uncirculated pennies from other metals, plastic and rubber.
The Blue Ridge Glass Company in Tennessee made experimental pennies using tempered glass.
Mr Burdette said the impressions on the coins were not precise, the weight and size were not uniform and the coins developed sharp edges that cut fingers.
He said they were probably destroyed.
Mr Burdette said only one other glass penny exists and it is broken.
The US Mint made 1943 pennies from low-grade steel covered in zinc.
Heritage Auctions in Fort Lauderdale is conducting Thursday's bidding.