The 1943-D steel penny with a doubled mintmark is one example of a rare mistake coin that can fetch several hundred dollars.

The 1933 George V penny is a rare and valuable coin with a mega estimated value. It's believed only six or seven of these special coins were ever minted which makes them incredibly rare.

Now did you know a special penny coin is worth a staggering £100,000 if you find it in your stash? The 1933 penny, with the face of George V on the obverse, can sell for a six figure sum ...