Errors increase the value of collectibles because a limited number go into circulation before it is spotted and corrected.
Business Intelligence | From W.D. Strategies on MSN

Got a $2,000 Quarter? Here’s What to Check Before Spending It

The Mystery of the Wisconsin Quarter Error What if that ordinary quarter in your pocket could actually be worth thousands of ...
If you’ve ever run across a blank coin, chances are you thought a metal token got mixed in with your change by mistake. In fact, blank coins are not uncommon due to errors during the minting process.
That’s a lot of coin. A Lincoln wheat penny minted in 1955 sold this month for $2,050 on eBay because it contains a rare feature known as a “double die error ...
That quarter you have in your pocket could be worth a lot more than you expected. An error on some 1999 Georgia state quarters has jacked up the value of some of the ...
Brits have been told to look out for a 50p coin that could be worth more than 80 times its face value. This coin, from 2017, has sold in the past for as much as £40 ...
Certain coins can be more thrilling than others, as some pieces carry significant value, ranging from a 'super rare' coin worth £4,000 to a £10 banknote that sell for thousands. In short, it's always ...